Flute-shaped pipe flow coefficient testing system and method

Abstract

The invention provides a flute-shaped pipe flow coefficient testing system and method, and the system comprises an air guiding pipe which is provided with a flute-shaped pipe; the air entraining pipe is divided into an upstream air entraining section and a downstream air entraining section on the two opposite sides of the flute-shaped pipe, an adjusting mechanism is arranged on the upstream air entraining section and used for adjusting flow information of entraining air, and a measuring mechanism is arranged on the outer side of the flute-shaped pipe and used for measuring injection information of the flute-shaped pipe; wherein the flute-shaped pipe is provided with a plurality of jet flow holes, a blocking mechanism is correspondingly arranged outside each jet flow hole, and the flow coefficient corresponding to each jet flow hole is obtained by opening the blocking mechanisms corresponding to the jet flow holes at different positions. According to the flute-shaped pipe flow coefficient testing system, the testing mechanism is used for sequentially and intermittently opening the jet flow holes in different positions so as to measure the flow coefficients of all the jet flow holes, and therefore data reference is provided for analyzing the anti-icing performance of the flute-shaped pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-icing system design, and particularly relates to a test system and method for the flow coefficient of a flute-shaped tube. Background Art

[0002] Icing on the lip of the engine nacelle intake will reduce the flow area of the intake, resulting in a decrease in the amount of air inhaled by the compressor, a drop in engine thrust, and even compressor surge.

[0003] Currently, a flute-shaped tube hot gas anti-icing system is often used for de-icing. When designing the flute-shaped tube anti-icing system, the flow coefficient of the jet holes on the flute-shaped tube is an important factor affecting the flow distribution. Due to the limited air extraction flow of the flute-shaped tube, the accurate measurement of the flow coefficient of the jet holes will directly affect the flow distribution of the downstream jet holes in the hot gas flow inside the flute-shaped tube, which may cause the flow rate of a single jet hole to be too high or too low, thus affecting the anti-icing performance analysis of the local area of the lip.

[0004] Based on this, the inventors of the present application propose a test system and method for the flow coefficient of a flute-shaped tube in order to solve the above technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect that the flow distribution of the jet holes on the flute-shaped tube cannot be monitored in the prior art, and to provide a test system and method for the flow coefficient of a flute-shaped tube.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides a test system for the flow coefficient of a flute-shaped tube, which is characterized by comprising:

[0008] An air extraction pipe, on which the flute-shaped tube is installed;

[0009] The air extraction pipe is divided into an upstream air extraction section and a downstream air extraction section on the opposite sides of the flute-shaped tube. An adjustment mechanism is provided on the upstream air extraction section, and the adjustment mechanism is used to adjust the flow information of the extracted air. Measuring mechanisms are provided on the opposite sides of the flute-shaped tube, and the measuring mechanisms are used to measure the jet information of the flute-shaped tube; wherein,

[0010] A plurality of jet holes are formed on the flute-shaped tube, and a blocking mechanism is correspondingly provided outside each jet hole. By opening the blocking mechanisms corresponding to the jet holes at different positions, the flow coefficient corresponding to each jet hole can be obtained.

[0011] According to an embodiment of the present invention, the upstream air extraction section is provided with an inlet flow sensor, an inlet pressure sensor, and an inlet temperature sensor, and the adjustment mechanism is located upstream of the inlet flow sensor, the inlet pressure sensor, and the inlet temperature sensor.

[0012] According to an embodiment of the present invention, the adjusting mechanism includes a pressure adjusting mechanism and a temperature adjusting mechanism. The pressure adjusting mechanism is used to adjust the pressure of the air flow in the air intake pipe, and the temperature adjusting mechanism is used to adjust the temperature of the air flow in the air intake pipe.

[0013] According to an embodiment of the present invention, an air supply mechanism is further provided upstream of the adjusting mechanism, and the air supply mechanism is used to supply air into the air intake pipe;

[0014] A control valve is further provided between the inlet flow sensor, the inlet pressure sensor, the inlet temperature sensor and the adjusting mechanism, and the control valve is used to control the on-off of the air intake pipe.

[0015] According to an embodiment of the present invention, an outlet temperature sensor, an outlet pressure sensor and an outlet flow sensor are provided in the downstream air intake section.

[0016] According to an embodiment of the present invention, the flow coefficient is related to the injection flow rate, the injection temperature and the injection pressure;

[0017] The measuring mechanism includes a pressure measuring unit and a temperature measuring unit, and the pressure measuring unit and the temperature measuring unit are respectively used to measure the pressure and temperature of the gas ejected from the jet holes.

[0018] According to an embodiment of the present invention, the plugging mechanism is a plugging tape, and the plugging tape is wound around the outside of the flute-shaped tube and covers the jet holes, and the flow coefficients of the jet holes at different positions are measured by puncturing the jet holes at different positions one by one.

[0019] According to an embodiment of the present invention, a plugging mechanism is provided outside each jet hole, and the flow coefficients of the jet holes at corresponding positions are measured by opening the plugging mechanisms at different positions.

[0020] According to an embodiment of the present invention, the plugging mechanism is a metal patch, and the metal patch is adhered to the outside of the jet hole.

[0021] The present invention also provides a method for testing the flow coefficient of a flute-shaped tube, which is characterized in that it is implemented by using the above-mentioned flute-shaped tube flow coefficient testing system, and the method includes:

[0022] Intermittently plug and open the jet holes at different positions;

[0023] Use the measuring mechanism to detect the flow coefficient of each jet hole one by one.

[0024] The positive and progressive effects of the present invention are:

[0025] The flow coefficient test system for the flute-shaped tube of the present invention can measure the flow coefficient of each jet hole of the flute-shaped tube in an intermittent opening and closing manner by using a measuring mechanism, solving the problems of high difficulty and poor accuracy in measuring the flow coefficient of a single jet hole of the traditional flute-shaped tube, and providing a reference for the anti-icing performance analysis of the flute-shaped tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other features, properties and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments, wherein:

[0027] Figure 1 is a schematic diagram of the flow coefficient test system for the flute-shaped tube of the present invention;

[0028] Figure 2 is a flowchart of the flow coefficient test method for the flute-shaped tube of the present invention.

[0029] 10. Air supply pipe; 110. Upstream air supply section; 111. Adjusting mechanism; 112. Measuring mechanism; 113. Inlet flow sensor; 114. Inlet pressure sensor; 115. Inlet temperature sensor; 116. Pressure adjusting mechanism; 117. Temperature adjusting mechanism; 118. Pressure measuring unit; 119. Temperature measuring unit; 120. Downstream air supply section; 121. Outlet temperature sensor; 122. Outlet pressure sensor; 123. Outlet flow sensor; 130. Air supply mechanism; 140. Control valve; 150. Hot gas recovery mechanism;

[0030] 20. Flute-shaped tube; 210. Jet hole; 220. Sealing mechanism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be further described below in conjunction with specific embodiments and the drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0033] Please refer to Figure 1, the present invention provides a test system for the flow coefficient of a flute-shaped tube, which includes an air guiding pipe 10. The flute-shaped tube 20 is installed on the air guiding pipe 10. The air guiding pipe 10 is divided into an upstream air guiding section 110 and a downstream air guiding section 120 on the opposite sides of the flute-shaped tube 20. An adjusting mechanism 111 is provided on the upstream air guiding section 110, and the adjusting mechanism 111 is used to adjust the flow information of the guided air. A measuring mechanism 112 is provided outside the flute-shaped tube, and the measuring mechanism 112 is used to measure the jet information of the flute-shaped tube 20.

[0034] A plurality of jet holes 210 are formed on the flute-shaped tube 20, and a blocking mechanism 220 is correspondingly provided outside each jet hole 210. By opening the blocking mechanisms 220 corresponding to the jet holes 210 at different positions, the flow coefficient corresponding to the jet hole 210 at this position can be measured.

[0035] It should be noted that the inner cavity of the flute-shaped tube 20 is communicated with the inner cavity of the air guiding pipe 10, and the gas in the air guiding pipe 10 is sprayed onto the de-icing target through the jet holes 210 on the flute-shaped tube 20 for de-icing. The upstream air guiding section 110 and the downstream air guiding section 120 are respectively connected to the flute-shaped tube 20, and the connection method is not limited here and can be bonding, welding, threaded connection, etc. The adjusting mechanism 111, as an adjusting mechanism for the gas in the air guiding pipe 10, is used to adjust the gas flow information leading to the flute-shaped tube 20. The measuring mechanism 112 is provided with a plurality of measuring points on the cross section at the outlet end of the jet hole 210 of the flute-shaped tube 20 to measure the flow coefficient of the jet hole 210.

[0036] Specifically, a blocking mechanism 220 is provided outside each jet hole 210. The blocking mechanism 220 can be a whole mechanism that seals all the jet holes 210. When it is necessary to open the jet hole 210 at the target position, only the blocking area at the target position needs to be opened. The opening method is not limited to needle piercing, cutting, etc. and is not limited here. The measuring mechanism 112 can measure the flow coefficients of the jet holes 210 at different positions one by one to finally obtain the flow coefficients of all the jet holes 210, which is beneficial to the analysis of the anti-icing performance of the flute-shaped tube 20.

[0037] Because the traditional method fails to accurately measure the flow coefficient of each jet hole 210, most of them adopt correction methods or equivalently measure all the jet holes 210 on the flute-shaped tube 20 as a whole. Therefore, the measurement accuracy of the flow coefficient of each jet hole 210 is poor, which may cause the flow rate of a single jet hole 210 to be too high or too low, affecting the accuracy of the anti-icing performance analysis of the flute-shaped tube 20.

[0038] In this application, by intermittently opening and blocking the jet holes 210 at different positions, the corresponding flow coefficient at each jet hole 210 can be obtained. Thus, the flow coefficients of the jet holes 210 at different positions can be accurately controlled to meet the target requirements of de-icing, completely avoiding the problem of large inlet flow and no flow at the outlet, and achieving precise control of the intake air flow, temperature, and pressure, thereby improving the de-icing effect.

[0039] In one embodiment, the upstream bleed air section 110 is provided with an inlet flow sensor 113, an inlet pressure sensor 114, and an inlet temperature sensor 115, and the adjustment mechanism 111 is located upstream of the inlet flow sensor 113, the inlet pressure sensor 114, and the inlet temperature sensor 115.

[0040] The inlet flow sensor 113 is used to detect the flow rate of the gas flowing to the side of the flute tube 20, the inlet pressure sensor 114 is used to detect the pressure of the gas flowing to the side of the flute tube 20, and the temperature sensor is used to detect the temperature of the gas flowing to the side of the flute tube 20. The adjustment mechanism 111 is used to adjust the injection information of the gas on the inlet side, and the injection information includes the temperature value and pressure value of the gas in the bleed air pipe 10.

[0041] Specifically, the adjustment mechanism 111 includes a pressure adjustment mechanism 116 and a temperature adjustment mechanism 117. The pressure adjustment mechanism 116 is used to adjust the pressure of the air flow in the bleed air pipe 10, and the temperature adjustment mechanism 117 is used to adjust the temperature of the air flow in the bleed air pipe 10.

[0042] That is to say, the pressure adjustment mechanism 116 is used to adjust the flow-through pressure of the gas in the bleed air pipe 10, and the temperature adjustment mechanism 117 is used to adjust the temperature value of the gas in the bleed air pipe 10.

[0043] In one embodiment, the pressure adjustment mechanism 116 can be a control valve, and the temperature adjustment mechanism 117 can be a heating sheet, etc., which are not limited herein.

[0044] In one embodiment, a gas supply mechanism 130 is further provided upstream of the adjustment mechanism 111. The gas supply mechanism 130 is used to supply gas to the bleed air pipe 10. A control valve 140 is further provided between the inlet flow sensor 113, the inlet pressure sensor 114, and the inlet temperature sensor 115 and the adjustment mechanism 111. The control valve 140 is used to control the on-off of the bleed air pipe 10.

[0045] The gas supply mechanism 130 can introduce the hot air on the engine compressor side to supply hot air into the bleed air pipe 10. It can also be provided with a dedicated gas supply mechanism 130 to supply hot air to the flute tube 20, which is not limited herein.

[0046] The control valve 140 is used to control the on-off of the air intake pipe 10 and belongs to a switch structure. When the control valve 140 is opened, the hot air on the side of the air supply mechanism 130 can be introduced into the flue-shaped pipe 20; when the control valve 140 is closed, the hot air on the side of the air supply mechanism 130 cannot be introduced into the flue-shaped pipe 20.

[0047] A hot air recovery mechanism 150 is also provided at the downstream end of the air intake pipe 10 to realize the recycling of hot air.

[0048] In one embodiment, an outlet temperature sensor 121, an outlet pressure sensor 122, and an outlet flow sensor 123 are provided in the downstream air intake section 120.

[0049] In the initial stage of the test, the installation tightness between the air intake pipe 10 and the flue-shaped pipe 20 can be detected by using the inlet flow sensor 113 and the outlet flow sensor 123. The outlet temperature sensor 121, the outlet pressure sensor 122, and the outlet flow sensor 123 are respectively used to obtain the temperature value, pressure value, and flow rate of the gas after passing through the flue-shaped pipe 20.

[0050] In one embodiment, the flow coefficient is related to the injection flow rate, injection temperature, and injection pressure. The measuring mechanism 112 includes a pressure measuring unit 118 and a temperature measuring unit 119. The pressure measuring unit 118 and the temperature measuring unit 119 are respectively used to measure the pressure and temperature of the gas ejected from the jet hole 210.

[0051] It should be noted that a plurality of measuring points are provided on the arc-shaped cross-section on the outlet side of the jet hole 210 to measure the temperature value and pressure value of the gas ejected from the jet hole 210 respectively.

[0052] In one embodiment, the blocking mechanism 220 is a blocking tape. The blocking tape is wound around the outside of the flue-shaped pipe 20 and covers all the jet holes 210. The flow coefficient of the jet holes 210 at different positions is measured by puncturing the jet holes 210 at different positions one by one.

[0053] The purpose of this application is to collect the pressure value and temperature value of the gas ejected from each jet hole 210. Therefore, the jet holes 210 at different positions can be punctured in sequence, and then measured one by one. The specific test process for the flow coefficient of the jet hole 210 is as follows:

[0054] The first step: First, wind the tape around the outside of all the jet holes 210. Set the pressure measuring unit 118 and the temperature measuring unit 119 on the ejection side of the jet hole 210. Remove or puncture the tape above the first jet hole 210, and use the adjustment mechanism 111 to adjust the inlet flow rate and temperature in the air intake pipe 10 to the target value, and then open the control valve 140.

[0055] After the temperature and pressure values at the cross-section where the first jet hole 210 is located become stable, use the temperature measurement unit 119 and the pressure measurement unit 118 to read the temperature value and pressure value of the gas ejected from the jet hole 210, and measure the flow rate value by using the difference between the inlet flow sensor 113 and the outlet flow sensor 123, so as to obtain the jet flow rate, temperature value and pressure value of the first jet hole 210.

[0056] Among them, the calculation formula for the flow coefficient of a single jet hole 210 is:

[0057]

[0058]

[0059] Among them, Q is the flow rate of the jet hole 210 (kg / s), T is the total temperature of the air flow in the jet hole 210 (K), P is the total pressure of the gas in the jet hole 210 (Pa), A is the area of the jet hole 210 (m2), and γ = 1.4.

[0060] Using the above formula, the flow coefficient curve of the first jet hole 210 can be obtained.

[0061] Step 2: After the measurement of the first jet hole 210 is completed, close the control valve 140, continue to remove or puncture the tape above the second jet hole 210, adjust the inlet flow rate, temperature and pressure of the flute tube 20, then open the control valve 140. After the jet temperature value and pressure value of the second jet hole 210 become stable, use the difference from the first jet hole 210 to obtain the flow rate, temperature and pressure values of the second jet hole 210. Further use the above formula to obtain the flow rate, temperature value and pressure value of the second jet hole 210.

[0062] Step 3: Perform the above cyclic measurement to finally obtain the flow rate, temperature value and pressure value of all the jet holes 210.

[0063] The above implementation manner is described by taking the tape as an example, but does not limit the specific structure of the plugging mechanism 220.

[0064] In some other implementation manners, a plugging mechanism 220 is provided outside each jet hole 210, and the flow coefficient of the jet hole 210 at the corresponding position is measured by opening the plugging mechanisms 220 at different positions.

[0065] Specifically, the test mechanism can be one, or a test mechanism can be provided outside each jet hole 210, which is not limited here. It can also be that a test mechanism measures the flow coefficients of the jet holes 210 at different positions by moving to different positions.

[0066] Further, the plugging mechanism 220 is a metal patch, and the metal patch is adhered to the outside of the jet hole 210.

[0067] A metal patch can be wound around the outside of the flute-shaped tube 20 and then cut to form a plurality of metal patches corresponding to the jet holes 210 one by one.

[0068] In summary, for the flute-shaped tube flow coefficient test system of the present invention, the measuring mechanism 112 can measure the flow coefficient of each jet hole 210 of the flute-shaped tube 20 in an intermittent opening and closing manner, solving the problems of high difficulty and poor accuracy in measuring the flow coefficient of a single jet hole 210 of the traditional flute-shaped tube 20, providing a reference for the anti-icing performance analysis of the flute-shaped tube 20, and facilitating the reasonable introduction of hot air at different temperatures, flows, and pressures for de-icing.

[0069] Please refer to Figure 2 , the present invention also proposes a method for testing the flow coefficient of a flute-shaped tube, which is implemented by using the above-mentioned flute-shaped tube flow coefficient test system. The test method includes:

[0070] S110. Intermittently plug and open the jet holes at different positions.

[0071] S120. Use the measuring mechanism to detect the flow coefficient of each jet hole one by one.

[0072] An entire plugging mechanism, such as a tape or a metal patch, can be arranged outside the jet hole, and then the jet holes at the corresponding positions can be opened one by one.

[0073] Alternatively, a plugging mechanism can also be arranged outside each jet hole. When it is necessary to measure the temperature value and pressure value at its position, the plugging mechanism at the corresponding position can be opened, and no limitation is made here.

[0074] The test mechanism is used to intermittently open the jet holes at different positions in sequence to measure the flow coefficients of all the jet holes, thereby providing a data reference for the anti-icing performance analysis of the flute-shaped tube.

[0075] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0076] This application uses specific terms to describe the embodiments of this application. For example, "an embodiment", "one embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that "an embodiment" or "one embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0077] Although the present invention is disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes, and decorations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention all fall within the protection scope defined by the claims of the present invention.

Claims

1. A flute flow coefficient testing system, characterized in that: include: An air bleed pipe, on which the flute-shaped pipe is mounted; The air bleed pipe is divided into an upstream air bleed section and a downstream air bleed section on opposite sides of the flute pipe, the upstream air bleed section is provided with a regulating mechanism, the regulating mechanism is used to adjust the flow information of the bleed air, and the flute pipe is provided with a measuring mechanism on opposite sides, the measuring mechanism is used to measure the injection information of the flute pipe; wherein, The flute tube is provided with a plurality of jet holes, and a blocking mechanism is correspondingly provided outside each of the jet holes. The flow coefficient corresponding to each of the jet holes is obtained by opening the blocking mechanisms corresponding to the jet holes at different positions.

2. The flute flow coefficient testing system according to claim 1, characterized in that: The upstream air bleed section is provided with an inlet flow sensor, an inlet pressure sensor and an inlet temperature sensor, and the regulating mechanism is located upstream of the inlet flow sensor, the inlet pressure sensor and the inlet temperature sensor.

3. The flute flow coefficient testing system according to claim 2, characterized in that: The regulating mechanism includes a pressure regulating mechanism and a temperature regulating mechanism. The pressure regulating mechanism is used to regulate the pressure of the airflow in the air duct, and the temperature regulating mechanism is used to regulate the temperature of the airflow in the air duct.

4. The flute flow coefficient testing system according to claim 2, characterized in that: An air supply mechanism is also provided upstream of the regulating mechanism, and the air supply mechanism is used to supply air into the air duct; A control valve is also provided between the inlet flow sensor, the inlet pressure sensor, the inlet temperature sensor and the regulating mechanism, and the control valve is used to control the on-off of the air duct.

5. The flute flow coefficient testing system according to claim 1, characterized in that: The downstream air bleed section is provided with an outlet temperature sensor, an outlet pressure sensor and an outlet flow sensor.

6. The flute flow coefficient testing system according to claim 1, characterized in that: The flow coefficient is related to the injection flow, injection temperature and injection pressure; The measuring mechanism comprises a pressure measuring unit and a temperature measuring unit, and the pressure measuring unit and the temperature measuring unit are used to measure the pressure and the temperature of the gas ejected from the jet hole respectively.

7. The flute flow coefficient testing system according to claim 1, characterized in that: The blocking mechanism is a blocking tape, which is wound around the outside of the flute and covers the jet holes. The jet holes at different positions are punctured one by one to measure the flow coefficients of the jet holes at different positions.

8. The flute flow coefficient testing system according to claim 1, characterized in that: A blocking mechanism is provided on the outside of each jet hole, and the flow coefficient of the jet hole at the corresponding position is measured by opening the blocking mechanisms at different positions.

9. The flute flow coefficient testing system according to claim 8, characterized in that: The blocking mechanism is a metal patch, and the metal patch is adhered to the outer side of the jet hole.

10. A method for testing the flow coefficient of a flute, characterized in that: The method is implemented by using the flute flow coefficient testing system according to any one of claims 1 to 9, and the method comprises: intermittently blocking and opening the jet holes at different positions; The flow coefficient of each jet hole is obtained by detecting it one by one using a measuring mechanism.

Images