Method for determining rain absorption capacity of turboprop engine in rain absorption airworthiness test

Abstract

The invention relates to the technical field of airspace engines, and discloses a turboprop engine rain absorption airworthiness test rain absorption capacity determination method, which comprises the following steps: determining the atmospheric rain concentration of a corresponding qualified approval standard according to the flight height, and determining the air flow corresponding to the inlet area of an engine air inlet channel; the result of the product of the atmospheric rain concentration of the qualified approval standard and the air flow corresponding to the inlet area of the engine air inlet channel is determined as the water absorption capacity corresponding to the inlet area of the engine air inlet channel; the air inflow of the turboprop engine is calculated, and the result of division of the water absorption capacity corresponding to the inlet area of an air inlet channel of the engine and the air inflow of the engine is determined as the atmospheric rain concentration considering the amplification effect; according to the atmospheric rain concentration considering the amplification effect and the airplane air inlet channel characteristics, the rain concentration of the turboprop engine rain absorption airworthiness test is determined, the engine amplification effect and the airplane air inlet channel characteristics are comprehensively considered, the rain concentration of the turboprop engine rain absorption airworthiness test is calculated, and a basis is provided for assessment of the rain absorption airworthiness test.

Description

Technical Field

[0001] The present invention relates to the technical field of aerospace engines, and particularly relates to a method for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine. Background Art

[0002] The rain ingestion airworthiness test of a turboprop engine is a series of tests to ensure the reliable operation of the turboprop engine in a rainfall environment. One of the key points of the rain ingestion airworthiness test of a turboprop engine is to determine the rain intake amount. The determination of the rain intake amount of a turboprop engine needs to consider the engine operating envelope, engine operating characteristics, magnification and reduction effects of rain concentration, and aircraft inlet characteristics. Currently, there is no method for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine. Summary of the Invention

[0003] In view of this, the present invention provides a method for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine to solve the problem that there is no method for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine in the prior art.

[0004] In a first aspect, the present invention provides a method for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine, the method comprising:

[0005] Determine the atmospheric rain concentration of the corresponding certification standard according to the flight altitude, and determine the air flow corresponding to the engine inlet area according to the engine inlet area, maximum flight speed and air density;

[0006] Determine the rain intake amount corresponding to the engine inlet area as the product result of the atmospheric rain concentration of the certification standard and the air flow corresponding to the engine inlet area;

[0007] Calculate the air intake of the turboprop engine, and determine the atmospheric rain concentration considering the magnification effect as the division result of the rain intake amount corresponding to the engine inlet area and the air intake of the engine;

[0008] Determine the rain concentration of the rain ingestion airworthiness test of the turboprop engine according to the atmospheric rain concentration considering the magnification effect and the aircraft inlet characteristics.

[0009] The present invention determines the atmospheric rain concentration of the corresponding certification standard according to the flight altitude, comprehensively considers the engine inlet area, maximum flight speed and air density, calculates the air flow corresponding to the engine inlet area. On this basis, calculates the rain intake amount corresponding to the engine inlet area according to the atmospheric rain concentration of the certification standard and the air flow corresponding to the engine inlet area, calculates the air intake of the turboprop engine, determines the atmospheric rain concentration considering the magnification effect, and calculates the rain concentration of the rain ingestion airworthiness test of the turboprop engine, providing a basis for the assessment of the rain ingestion airworthiness test.

[0010] In an alternative embodiment, determining the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude includes:

[0011] Pre-acquiring the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard;

[0012] Using the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard to determine the atmospheric rain concentration of the qualified certification standard corresponding to the flight altitude.

[0013] The present invention determines the atmospheric rain concentration of the qualified certification standard corresponding to the flight altitude by considering the corresponding relationship between different flight altitudes and the atmospheric rain concentration of the qualified certification standard, so as to provide a data basis.

[0014] In an alternative embodiment, determining the air flow corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed and the air density includes:

[0015] Determining the maximum flight speed corresponding to the flight altitude according to the working envelope of the turboprop engine;

[0016] Determining the product result of the engine inlet area, the maximum flight speed and the air density as the air flow corresponding to the engine inlet area.

[0017] The present invention determines the maximum flight speed corresponding to the flight altitude by using the working envelope of the turboprop engine to reflect the air intake situation at the flight altitude, and calculates the air flow corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed and the air density, providing a data basis for the rain intake calculation and airworthiness test.

[0018] In an alternative embodiment, calculating the air intake of the turboprop engine includes:

[0019] Calculating the engine air intake according to the engine working state in combination with the flight altitude, the maximum flight speed and the ambient temperature.

[0020] The present invention comprehensively calculates the engine air intake by considering the engine working state in combination with the flight altitude, the maximum flight speed and the ambient temperature to accurately reflect the actual air intake situation of the engine.

[0021] In an alternative embodiment, determining the rain concentration of the engine rain intake test according to the atmospheric rain concentration considering the amplification effect and the aircraft inlet characteristics includes:

[0022] Judging whether the installed aircraft has a bypass aircraft inlet;

[0023] If the installed aircraft has a bypass aircraft inlet, then judging whether the aircraft inlet is installed;

[0024] If an aircraft inlet is installed, determine the atmospheric rain concentration considering the amplification effect as the rain concentration for the engine rain ingestion test;

[0025] If an aircraft inlet is not installed, determine the bypass efficiency of the aircraft inlet, and calculate the rain concentration for the engine rain ingestion test according to the bypass efficiency of the aircraft inlet and the atmospheric rain concentration considering the amplification effect;

[0026] If the installed aircraft inlet does not have a bypass, determine the atmospheric rain concentration considering the amplification effect as the rain concentration for the engine rain ingestion test.

[0027] By further considering whether the installed aircraft inlet has a bypass when determining the rain concentration for the engine rain ingestion test, the present invention determines the rain concentration for the engine rain ingestion test respectively in the case of an installed aircraft inlet with a bypass and an installed aircraft inlet without a bypass, so as to reflect the rain ingestion characteristics of the engine under different inlet configurations and provide a data basis for the assessment of the rain ingestion airworthiness test.

[0028] In an optional embodiment, the bypass efficiency of the aircraft inlet is determined in the following manner:

[0029] Determine the bypass efficiency of the aircraft inlet as the result of dividing the mass of rainwater separated by the bypass flow path by the mass of rainwater at the inlet of the inlet.

[0030] The present invention calculates the bypass efficiency of the aircraft inlet according to the mass of rainwater separated by the bypass flow path and the mass of rainwater at the inlet of the inlet, so as to calculate the rain concentration for the engine rain ingestion test in the case of not installing an aircraft inlet with a bypass.

[0031] In a second aspect, the present invention provides a device for determining the rain ingestion amount in a turboprop engine rain ingestion airworthiness test, and the device includes:

[0032] A first determination module, configured to determine the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude, and determine the air flow corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed and the air density;

[0033] A second determination module, configured to determine the rain ingestion amount corresponding to the engine inlet area as the product result of the atmospheric rain concentration corresponding to the qualified certification standard and the air flow corresponding to the engine inlet area;

[0034] A third determination module, configured to calculate the air intake of the turboprop engine, and determine the atmospheric rain concentration considering the amplification effect as the result of dividing the rain ingestion amount corresponding to the engine inlet area by the air intake of the engine;

[0035] A fourth determination module, configured to determine the rain concentration of the rain ingestion airworthiness test for a turboprop engine according to the atmospheric rain concentration considering the amplification effect and the characteristics of the aircraft inlet duct.

[0036] In a third aspect, the present invention provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the method for determining the rain ingestion amount of the rain ingestion airworthiness test for a turboprop engine according to the first aspect or any corresponding embodiment thereof.

[0037] In a fourth aspect, the present invention provides a computer-readable storage medium, on which computer instructions are stored. The computer instructions are used to cause a computer to execute the method for determining the rain ingestion amount of the rain ingestion airworthiness test for a turboprop engine according to the first aspect or any corresponding embodiment thereof.

[0038] In a fifth aspect, the present invention provides a computer program product, including computer instructions, which are used to cause a computer to execute the method for determining the rain ingestion amount of the rain ingestion airworthiness test for a turboprop engine according to the first aspect or any corresponding embodiment thereof. Description of the Drawings

[0039] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 It is a schematic diagram of the influence of the intake coefficient according to an embodiment of the present invention;

[0041] Figure 2 It is a schematic flowchart of the method for determining the rain ingestion amount of the rain ingestion airworthiness test for a turboprop engine according to an embodiment of the present invention;

[0042] Figure 3 It is a schematic flowchart of determining the rain concentration of the engine rain ingestion test according to an embodiment of the present invention;

[0043] Figure 4 It is a structural block diagram of the device for determining the rain ingestion amount of the rain ingestion airworthiness test for a turboprop engine according to an embodiment of the present invention;

[0044] Figure 5 It is a schematic hardware structure diagram of the computer device according to an embodiment of the present invention. Detailed Embodiments

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0046] The determination of the rain intake of a turboprop engine needs to be determined according to factors such as the engine operating envelope, engine operating characteristics, and the amplification and reduction effects of rain concentration. Among them, the amplification and reduction effects of rain concentration are as follows: When encountering rain during flight, for a given atmospheric rain concentration, changing the engine power or thrust and flight speed can change the rain concentration inside the engine.

[0047] Among them, the amplification and reduction effects of rain concentration are affected by the intake coefficient and relative velocity centrifugation, specifically as follows:

[0048] (1) Intake coefficient effect

[0049] The airflow captured at the inlet varies greatly with engine power and flight speed. As Figure 1 shown, at low power and high flight speed, a large proportion of the air in front of the inlet duct overflows through the inlet lip. The intake coefficient will increase as the engine speed decreases and the aircraft speed increases. This coefficient characterizes the degree of increased inlet overflow and decreased captured airflow of the engine. Due to weight, large raindrops and hailstones are relatively less affected by the overflow and are usually captured by the inlet duct. The inlet area determines the amount of rain and hail entering the inlet duct. This amplification effect is equivalent to the ratio of the nacelle inlet rain collection area AH to the air collection area AC. A turbofan engine with an outer bypass duct may have additional internal intake coefficient effects because at low power and high flight speed, the core engine airflow will separate from the nacelle inlet to the core engine inlet. Therefore, the intake coefficient effect will ultimately amplify the rain and hail concentration, and this amplification effect reaches its maximum value in the combination of high flight speed and low power or thrust.

[0050] Among them, Figure 1 The first figure in it shows that at low engine speed / high flight speed, the separation of the inlet airflow will increase the water / air ratio at the engine inlet section. The second figure shows that at high engine speed / low flight speed, the separation of the inlet airflow will weaken, thereby reducing the water / air ratio at the engine inlet section.

[0051] (2) Relative velocity centrifugation effect

[0052] Some rain, under the action of the centrifugal force of the propeller, will not enter the engine. This beneficial effect depends on the geometric shape and rotational speed of the propeller blades, the design and position of the air intake duct, the design of the engine, the speed of the aircraft, and the size of the raindrops.

[0053] In the current advisory circular for the rain ingestion airworthiness test of turboprop engines, the propeller blades are usually removed, resulting in a more stringent test assessment. Therefore, for the amplification and reduction effects of rain concentration, only the influence of the intake coefficient needs to be considered. The embodiment of the present invention provides a method for determining the rain ingestion amount in the rain ingestion airworthiness test of a turboprop engine. Without performing simulation calculations or experimental verifications on the amplification effect of rain concentration, by comprehensively considering factors such as the engine operating envelope, engine operating characteristics, and the amplification and reduction effects of rain concentration, the influence of the amplification effect on rain concentration can be determined in the most stringent manner, providing a basis for the assessment of the rain ingestion airworthiness test.

[0054] According to an embodiment of the present invention, there is provided an embodiment of a method for determining the rain ingestion amount in the rain ingestion airworthiness test of a turboprop engine. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0055] In this embodiment, a method for determining the rain ingestion amount in the rain ingestion airworthiness test of a turboprop engine is provided. Figure 2 It is a flowchart of the method for determining the rain ingestion amount in the rain ingestion airworthiness test of a turboprop engine according to an embodiment of the present invention. As Figure 2 shown, the process includes the following steps:

[0056] Step S201, determine the atmospheric rain concentration of the corresponding certification standard according to the flight altitude, and determine the air flow rate corresponding to the engine air intake duct inlet area according to the engine air intake duct inlet area, maximum flight speed, and air density.

[0057] In the embodiment of the present invention, the turboprop engine operating envelope refers to the one determined through negotiation in combination with the aircraft usage requirements during the design stage. The turboprop engine operating envelope includes the temperature range, flight altitude range, flight speed range, etc. in which the engine operates. Determine the flight altitude H according to the turboprop engine operating envelope, where the altitude interval is determined by oneself. Query the atmospheric rain concentration B1 of the corresponding certification standard for the flight altitude, and calculate the air flow rate W1 corresponding to the engine air intake duct inlet area according to the engine air intake duct inlet area, maximum flight speed, and air density.

[0058] Step S202, determine the rain ingestion amount corresponding to the engine air intake duct inlet area as the product result of the atmospheric rain concentration of the certification standard and the air flow rate corresponding to the engine air intake duct inlet area.

[0059] In an embodiment of the present invention, the atmospheric rain concentration of the type certification standard is multiplied by the air flow corresponding to the inlet area of the engine inlet duct to calculate the rainfall absorption amount C1 corresponding to the inlet area of the engine inlet duct, where C1 = W1 * B1.

[0060] Step S203: Calculate the air intake of the turboprop engine, and determine the atmospheric rain concentration considering the amplification effect as the division result of the rainfall absorption amount corresponding to the inlet area of the engine inlet duct and the air intake of the engine.

[0061] In an embodiment of the present invention, calculate the air intake W2 of the turboprop engine, perform a division operation on the rainfall absorption amount corresponding to the inlet area of the engine inlet duct and the air intake of the engine, and calculate the atmospheric rain concentration B2 considering the amplification effect. Using the most stringent method, all the rainfall absorption amount C1 corresponding to the inlet area of the inlet duct at the current flight altitude and maximum flight speed is inhaled into the engine, and the air flow at the inlet of the inlet duct is determined according to the true air flow required by the current engine operating state. Calculate the atmospheric rain concentration B2 considering the amplification effect, which is the ratio of the two, that is, B2 = C1 / W2.

[0062] Step S204: Determine the rain concentration of the turboprop engine rain absorption airworthiness test according to the atmospheric rain concentration considering the amplification effect and the characteristics of the aircraft inlet duct.

[0063] In an embodiment of the present invention, after obtaining the atmospheric rain concentration B2 considering the amplification effect, the rain absorption concentration B3 determined by the rain absorption test needs to be further calculated according to whether the aircraft inlet duct is installed during the test, that is, whether to consider the bypass separation efficiency of the inlet duct. According to the characteristics of the aircraft inlet duct, determine the corresponding rain concentration B3 of the turboprop engine rain absorption airworthiness test in different situations.

[0064] The method for determining the rainfall absorption amount of the turboprop engine rain absorption airworthiness test provided in this embodiment determines the atmospheric rain concentration of the type certification standard corresponding to the flight altitude, comprehensively considers the inlet area of the engine inlet duct, the maximum flight speed, and the air density, calculates the air flow corresponding to the inlet area of the engine inlet duct. On this basis, calculate the rainfall absorption amount corresponding to the inlet area of the engine inlet duct according to the atmospheric rain concentration of the type certification standard and the air flow corresponding to the inlet area of the engine inlet duct, so that the calculated rainfall absorption amount fits the actual flight conditions, calculate the air intake of the turboprop engine, determine the atmospheric rain concentration considering the amplification effect, and calculate the rain concentration of the turboprop engine rain absorption airworthiness test, providing a basis for the assessment of the rain absorption airworthiness test.

[0065] In this embodiment, a method for determining the rainfall absorption amount of the turboprop engine rain absorption airworthiness test is provided, and the process includes the following steps:

[0066] Step S301: Determine the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude, and determine the air flow corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed, and the air density.

[0067] Specifically, the determination of the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude in the above step S301 includes:

[0068] Step S3011: Obtain in advance the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard.

[0069] Step S3012: Use the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard to determine the atmospheric rain concentration corresponding to the flight altitude of the qualified certification standard.

[0070] In the embodiment of the present invention, as shown in Table 1, Table 1 stores the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard. Among them, the atmospheric rain concentration corresponding to other altitudes can be determined by linear interpolation.

[0071] Table 1

[0072]

[0073] Query Table 1 to obtain the atmospheric rain concentration corresponding to the flight altitude of the qualified certification standard.

[0074] By considering the corresponding relationship between different flight altitudes and the atmospheric rain concentration of the qualified certification standard, determine the atmospheric rain concentration corresponding to the flight altitude of the qualified certification standard to provide a data basis.

[0075] Specifically, the determination of the air flow corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed, and the air density in the above step S301 includes:

[0076] Step S3013: Determine the maximum flight speed corresponding to the flight altitude according to the working envelope of the turboprop engine.

[0077] Step S3014: Determine the product result of the engine inlet area, the maximum flight speed, and the air density as the air flow corresponding to the engine inlet area.

[0078] In the embodiment of the present invention, when calculating the air flow corresponding to the flight altitude, first determine the maximum flight speed V according to the working envelope of the turboprop engine, determine the engine inlet area A, and perform a product operation on the engine inlet area, the maximum flight speed, and the air density to calculate the air flow W1 = A * V * ρ.

[0079] By using the operating envelope of the turboprop engine to determine the maximum flight speed corresponding to the flight altitude, so as to reflect the intake air condition at the flight altitude, calculate the air flow corresponding to the inlet area of the engine inlet duct according to the inlet area of the engine inlet duct, the maximum flight speed and the air density, and provide a data basis for the calculation of the rain absorption amount and the airworthiness test.

[0080] Step S302, determine the rain absorption amount corresponding to the inlet area of the engine inlet duct as the product result of the atmospheric rain concentration of the certification standard and the air flow corresponding to the inlet area of the engine inlet duct.

[0081] For details, please refer to Figure 2 Step S202 of the illustrated embodiment, which will not be elaborated here.

[0082] Step S303, calculate the air intake of the turboprop engine, and determine the atmospheric rain concentration considering the amplification effect as the division result of the rain absorption amount corresponding to the inlet area of the engine inlet duct and the air intake of the engine.

[0083] Specifically, calculating the air intake of the turboprop engine in the above step S303 includes:

[0084] Step S3031, calculate the air intake of the engine according to the engine operating state, in combination with the flight altitude, the maximum flight speed, and the ambient temperature.

[0085] In the embodiment of the present invention, the engine operating states include ground idle state, flight idle state, cruise state, maximum continuous state, takeoff state, etc. The flight altitude affects the atmospheric pressure and temperature, the maximum flight speed affects the dynamic pressure of the intake air, and the ambient temperature directly affects the air density. Determine the engine operating state, and in combination with the flight altitude H, the maximum flight speed V, and the ambient temperature T, calculate the air intake W2 of the engine.

[0086] Determining the engine state means determining the compressor speed (N) and the pressure ratio (π), and obtaining the flow coefficient (φ) through the compressor characteristic curve. The air intake of the engine wherein, A2 is the compressor inlet area, P2 is the total pressure at the compressor inlet, T2 is the total temperature at the compressor inlet, R is the gas constant, and k is the specific heat ratio of the gas.

[0087] By considering the engine operating state, in combination with the flight altitude, the maximum flight speed, and the ambient temperature, comprehensively calculate the air intake of the engine to accurately reflect the actual air intake condition of the engine.

[0088] Step S304, determine the rain concentration for the rain absorption airworthiness test of the turboprop engine according to the atmospheric rain concentration considering the amplification effect and the characteristics of the aircraft inlet duct.

[0089] Specifically, the above step S304 includes:

[0090] Step S3041: Determine whether the installed aircraft has a bypass aircraft inlet duct.

[0091] Step S3042: If the installed aircraft has a bypass aircraft inlet duct, then determine whether the aircraft inlet duct is installed.

[0092] Step S3043: If the aircraft inlet duct is installed, then determine the atmospheric rain concentration considering the amplification effect as the rain concentration for the engine rain ingestion test.

[0093] Step S3044: If the aircraft inlet duct is not installed, then determine the bypass efficiency of the aircraft inlet duct, and calculate the rain concentration for the engine rain ingestion test according to the bypass efficiency of the aircraft inlet duct and the atmospheric rain concentration considering the amplification effect.

[0094] Step S3045: If the installed aircraft does not have a bypass aircraft inlet duct, then determine the atmospheric rain concentration considering the amplification effect as the rain concentration for the engine rain ingestion test.

[0095] In the embodiment of the present invention, according to the external characteristics of the aircraft inlet duct, determine whether the installed aircraft has a bypass aircraft inlet duct. For example, Figure 3 as shown, if the installed aircraft has a bypass aircraft inlet duct, then further determine whether the aircraft inlet duct is installed.

[0096] For example, Figure 3 as shown, if the aircraft inlet duct is installed, then the rain concentration B3 for the engine rain ingestion test = the atmospheric rain concentration B2 considering the amplification effect. If the aircraft inlet duct is not installed, then first calculate the bypass efficiency D1 of the aircraft inlet duct, and calculate the rain concentration B3 for the engine rain ingestion test according to the bypass efficiency D1 of the aircraft inlet duct and the atmospheric rain concentration B2 considering the amplification effect. The rain concentration B3 for the engine rain ingestion test = B2*(1 - D1).

[0097] If the installed aircraft does not have a bypass aircraft inlet duct, then the rain concentration B3 for the engine rain ingestion test = the atmospheric rain concentration B2 considering the amplification effect.

[0098] By further considering whether the installed aircraft has a bypass aircraft inlet duct when determining the rain concentration for the engine rain ingestion test, determine the rain concentration for the engine rain ingestion test respectively in the cases where the installed aircraft has a bypass aircraft inlet duct and the installed aircraft does not have a bypass aircraft inlet duct, so as to reflect the rain ingestion characteristics of the engine under different inlet duct configurations and provide a data basis for the assessment of the rain ingestion airworthiness test.

[0099] In some alternative embodiments, determine the bypass efficiency of the aircraft inlet duct according to the following steps:

[0100] Step Sa: Determine the division result of the rainwater mass separated by the bypass flow path and the rainwater mass at the inlet of the inlet duct as the bypass efficiency of the aircraft inlet duct.

[0101] In an embodiment of the present invention, to calculate the bypass efficiency of an aircraft inlet, the bypass efficiency D1 of the aircraft inlet = the mass of rainwater separated by the bypass channel / the mass of rainwater at the inlet of the inlet.

[0102] The method for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine provided in this embodiment calculates the bypass efficiency of the aircraft inlet according to the mass of rainwater separated by the bypass channel and the mass of rainwater at the inlet of the inlet, so as to calculate the rain concentration in the engine rain ingestion test in the case where an aircraft inlet with a bypass is not installed.

[0103] In this embodiment, a device for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine is also provided. This device is used to implement the above-mentioned embodiments and preferred implementation manners, and those that have been described will not be repeated. As used hereinafter, the term "module" can be a combination of software and / or hardware that can achieve a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware is also possible and contemplated.

[0104] This embodiment provides a device for determining the rain intake amount in the rain ingestion airworthiness test of a turboprop engine, as Figure 4 shown, including:

[0105] A first determination module 401, configured to determine the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude, and determine the air flow corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed, and the air density.

[0106] A second determination module 402, configured to determine the product result of the atmospheric rain concentration corresponding to the qualified certification standard and the air flow corresponding to the engine inlet area as the rain intake amount corresponding to the engine inlet area.

[0107] A third determination module 403, configured to calculate the air intake of the turboprop engine, and determine the division result of the rain intake amount corresponding to the engine inlet area and the air intake of the engine as the atmospheric rain concentration considering the amplification effect.

[0108] A fourth determination module 404, configured to determine the rain concentration in the rain ingestion airworthiness test of the turboprop engine according to the atmospheric rain concentration considering the amplification effect and the characteristics of the aircraft inlet.

[0109] In some alternative implementation manners, the first determination module 401 includes:

[0110] An acquisition unit, configured to pre-acquire the corresponding relationship between each flight altitude and the atmospheric rain concentration corresponding to the qualified certification standard.

[0111] The first determination unit is configured to determine the atmospheric rain concentration corresponding to the qualified certification standard at the flight altitude by using the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard.

[0112] In some alternative embodiments, the first determination module 401 includes:

[0113] The second determination unit is configured to determine the maximum flight speed corresponding to the flight altitude according to the working envelope of the turboprop engine.

[0114] The third determination unit is configured to determine the air flow rate corresponding to the engine inlet area as the product result of the engine inlet area, the maximum flight speed, and the air density.

[0115] In some alternative embodiments, the third determination module 403 includes:

[0116] The calculation unit is configured to calculate the engine air intake according to the engine working state in combination with the flight altitude, the maximum flight speed, and the ambient temperature.

[0117] In some alternative embodiments, the fourth determination module 404 includes:

[0118] The first judgment unit is configured to judge whether the installed aircraft has a bypass aircraft inlet.

[0119] The second judgment unit is configured to judge whether the aircraft inlet is installed if the installed aircraft has a bypass aircraft inlet.

[0120] The fourth determination unit is configured to determine the atmospheric rain concentration considering the amplification effect as the rain concentration of the engine rain ingestion test if the aircraft inlet is installed.

[0121] The calculation unit is configured to determine the bypass efficiency of the aircraft inlet if the aircraft inlet is not installed, and calculate the rain concentration of the engine rain ingestion test according to the bypass efficiency of the aircraft inlet and the atmospheric rain concentration considering the amplification effect.

[0122] The fifth determination unit is configured to determine the atmospheric rain concentration considering the amplification effect as the rain concentration of the engine rain ingestion test if the installed aircraft does not have a bypass aircraft inlet.

[0123] In some alternative embodiments, the device further includes:

[0124] The sixth determination unit is configured to determine the bypass efficiency of the aircraft inlet as the division result of the rainwater mass separated by the bypass flow path and the rainwater mass at the inlet of the inlet.

[0125] The further function descriptions of the above-mentioned various modules and units are the same as those in the corresponding above embodiments, and will not be repeated here.

[0126] The device for determining the rain absorption amount in the rain absorption airworthiness test of the turboprop engine in this embodiment is presented in the form of functional units. Here, the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and a memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0127] An embodiment of the present invention further provides a computer device having the above Figure 4 shown device for determining the rain absorption amount in the rain absorption airworthiness test of the turboprop engine.

[0128] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a computer device provided by an alternative embodiment of the present invention. As Figure 5 shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including a high-speed interface and a low-speed interface. Each component communicates with each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some alternative embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 5 In

[0129] FIG. 16, one processor 10 is taken as an example.

[0130] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0131] The memory 20 may include a program storage area and a data storage area. The program storage area may store an operating system and application programs required for at least one function. The data storage area may store data created according to the use of the computer device and the like. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 20 may optionally include a memory remotely disposed relative to the processor 10, and these remote memories may be connected to the computer device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0132] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk, or a solid-state drive; the memory 20 may further include a combination of the above-mentioned types of memories.

[0133] The computer device further includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30, and the output device 40 may be connected through a bus or other means. Figure 5 Taking connection through a bus as an example.

[0134] The input device 30 may receive input digital or character information, and generate key signal inputs related to the user settings and function controls of the computer device, such as a touch screen. The output device 40 may include a display device and the like.

[0135] The embodiments of the present invention further provide a computer-readable storage medium. The methods according to the embodiments of the present invention may be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented as computer code originally stored in a remote storage medium or a non-transitory machine-readable storage medium and downloaded through a network and to be stored in a local storage medium, so that the methods described herein can be processed by such software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium may be a magnetic disk, an optical disk, a read-only memory, a random access memory, a flash memory, a hard disk, or a solid-state drive, etc.; further, the storage medium may also include a combination of the above-mentioned types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code, and when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the methods shown in the above embodiments are implemented.

[0136] A part of the present invention can be applied as a computer program product, for example, computer program instructions, which, when executed by a computer, can call or provide the methods and / or technical solutions according to the present invention through the operations of the computer. Those skilled in the art should understand that the forms of existence of computer program instructions in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways for a computer to execute computer program instructions include, but are not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Herein, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible by the computer.

[0137] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope of this application.

Claims

1. A method for determining the rain absorption amount in the rain absorption airworthiness test of a turboprop engine, characterized in that, The method includes: Determining the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude, and determining the air flow rate corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed, and the air density; Determining the rainfall amount corresponding to the engine inlet area by multiplying the atmospheric rain concentration of the qualified certification standard and the air flow rate corresponding to the engine inlet area; Calculating the air intake of the turboprop engine, and determining the atmospheric rain concentration considering the amplification effect by dividing the rainfall amount corresponding to the engine inlet area by the air intake of the engine; Determining the rain concentration for the turboprop engine rain ingestion airworthiness test according to the atmospheric rain concentration considering the amplification effect and the characteristics of the aircraft inlet.

2. The method according to claim 1, characterized in that The determining the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude includes: Pre-acquiring the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard; Using the corresponding relationship between each flight altitude and the atmospheric rain concentration of the qualified certification standard to determine the atmospheric rain concentration corresponding to the flight altitude.

3. The method according to claim 1, characterized in that The determining the air flow rate corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed, and the air density includes: Determining the maximum flight speed corresponding to the flight altitude according to the turboprop engine operating envelope; Determining the air flow rate corresponding to the engine inlet area by multiplying the engine inlet area, the maximum flight speed, and the air density.

4. The method according to claim 1, wherein The calculating the air intake of the turboprop engine includes: Calculating the air intake of the engine according to the engine operating state, in combination with the flight altitude, the maximum flight speed, and the ambient temperature.

5. The method according to claim 1, characterized in that, The determining the rain concentration for the engine rain ingestion test according to the atmospheric rain concentration considering the amplification effect and the characteristics of the aircraft inlet includes: Judging whether the installed aircraft inlet has a bypass; If the installed aircraft inlet has a bypass, then judging whether the aircraft inlet is installed; If the aircraft inlet is installed, then determining the atmospheric rain concentration considering the amplification effect as the rain concentration for the engine rain ingestion test; If the aircraft inlet is not installed, then determining the bypass efficiency of the aircraft inlet, and calculating the rain concentration for the engine rain ingestion test according to the bypass efficiency of the aircraft inlet and the atmospheric rain concentration considering the amplification effect; If the installed aircraft inlet does not have a bypass, then determining the atmospheric rain concentration considering the amplification effect as the rain concentration for the engine rain ingestion test.

6. The method according to claim 5, wherein The bypass efficiency of the aircraft inlet is determined in the following manner: Determining the bypass efficiency of the aircraft inlet by dividing the mass of rainwater separated by the bypass flow path by the mass of rainwater at the inlet of the inlet.

7. A device for determining the amount of rain absorbed in the rain ingestion airworthiness test of a turboprop engine, characterized in that, The device includes: A first determination module for determining the atmospheric rain concentration corresponding to the qualified certification standard according to the flight altitude, and determining the air flow rate corresponding to the engine inlet area according to the engine inlet area, the maximum flight speed, and the air density; A second determination module for determining the rainfall amount corresponding to the engine inlet area by multiplying the atmospheric rain concentration of the qualified certification standard and the air flow rate corresponding to the engine inlet area; A third determination module, configured to calculate the intake air volume of the turboprop engine, and determine the atmospheric rain concentration considering the amplification effect by dividing the rainfall amount corresponding to the inlet area of the engine air intake duct by the intake air volume of the engine; A fourth determination module, configured to determine the rain concentration of the turboprop engine rain ingestion airworthiness test according to the atmospheric rain concentration considering the amplification effect and the characteristics of the aircraft air intake duct.

8. A computer device, characterized in that, Comprising: A memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the method for determining the rainfall amount in the turboprop engine rain ingestion airworthiness test according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, Computer instructions are stored on the computer-readable storage medium, and the computer instructions are used to cause a computer to execute the method for determining the rainfall amount in the turboprop engine rain ingestion airworthiness test according to any one of claims 1 to 6.

10. A computer program product, characterized in that, Comprising computer instructions, and the computer instructions are used to cause a computer to execute the method for determining the rainfall amount in the turboprop engine rain ingestion airworthiness test according to any one of claims 1 to 6.

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