Analysis method and system for influence of rail control pipeline flow resistance deviation on equalization discharge of storage tank

Abstract

The present application relates to the field of space attitude and orbit control power system, in the field, the attitude and orbit control power system adopts double-component constant pressure extrusion type propelling system, which is generally in the form of four storage tanks laid flat, two of which are filled with oxidizer and the other two are filled with fuel. The storage tank of the propelling system is usually selected as a surface tension storage tank, and the two parallel working storage tanks of the same component are required to have a balanced discharge index of more than 3%. The flow resistance deviation of the pipeline has a great influence on the balanced discharge. The present application discloses an analysis method and system for the influence of the flow resistance deviation of the pipeline on the balanced discharge of the storage tank. Through the method, the flow deviation of the two surface tension storage tanks of the same component caused by the flow resistance deviation of the pipeline can be theoretically estimated, so that the percentage value of the unbalanced discharge can be calculated. A reference method is provided for the analysis and control of the unbalanced discharge of the two storage tanks of the same component in the deep space field attitude and orbit control power system.

Description

Technical Field

[0001] This invention relates to the field of aerospace attitude and orbit control power systems, specifically to an analysis method and system for the impact of orbit control pipeline flow resistance deviation on tank balanced discharge. Background Technology

[0002] With the continuous development of aerospace technology, attitude and orbit control propulsion systems are increasingly trending towards lightweight and high-performance designs. This is especially true in deep space propulsion systems, where limited launch capacity and diverse scientific exploration missions impose stringent requirements on the overall weight of the probe. Similarly, the requirements for the dry weight and propellant utilization rate of the propulsion system are becoming increasingly stringent. Dry weight control can be achieved through system configuration and structural optimization design to reduce weight. Improving propellant utilization rate mainly involves two aspects: firstly, increasing the discharge efficiency of the propellant tanks; and secondly, improving the balanced discharge of parallel tanks. Currently, deep space propellant tanks mostly employ large-volume surface tension tanks, with discharge efficiencies generally not lower than 99.5%, leaving limited room for improvement. Improving the balanced discharge of parallel tanks can enhance propellant utilization, reduce unusable propellant, and decrease the shift in the center of mass of the satellite or probe, thereby reducing interference torque and unnecessary propellant consumption. Taking a certain deep-space probe as an example, the total propellant loading is approximately 3000 kg, the oxidizer loading is approximately 1868 kg, and the loading capacity of a single oxidizer tank is 934 kg; the fuel loading is approximately 1132 kg, and the loading capacity of a single fuel tank is 566 kg. If the equilibrium emission index of the oxidizer or fuel tank can be increased by 1%, 9.34 kg of oxidizer (or 5.66 kg of fuel) can be saved. This is highly beneficial for system weight reduction, center of gravity stability, and control of disturbance torque. Alternatively, it is crucial to constrain the equilibrium emission index within the overall technical specifications through analysis and control methods. According to flight test statistics, the orbital control engine of a deep-space probe propulsion system typically consumes 80%–90% of the propellant loading in orbit, and the flow resistance deviation of the orbital control pipeline is a significant factor affecting the equilibrium emission of parallel tanks. Therefore, it is very meaningful to estimate the deviation value of the tank imbalance caused by the flow resistance deviation of the track control pipeline through theoretical analysis, and to use this value as one of the important bases for the actual adjustment of the flow resistance of the track control pipeline in order to achieve the goal of reducing uneven emissions.

[0003] In deep space, attitude and orbit control propulsion systems often employ a bicomponent constant-pressure extrusion propulsion system. This typically consists of four flat-laid tanks: two filled with oxidizer and two filled with fuel. The tanks are generally surface tension tanks, and tanks with the same component have interconnected gas and liquid circuits during in-orbit flight. A typical schematic diagram of a bicomponent constant-pressure extrusion propulsion system can be found here. Figure 2As shown, pressurized gas is delivered via pipelines to the oxidizer and fuel tanks respectively. The gas and liquid circuits of both oxidizer and fuel tanks are interconnected. After entering the tanks, the gas compresses the propellant and, through orifice plates, liquid circuit valve modules, and rail and attitude control pipelines, delivers the propellant to the rail control engine and its solenoid valves. When the rail control and attitude control engines need to ignite, the corresponding solenoid valves are opened to generate thrust. Generally, the flow resistance of the rail control pipelines in two tanks with the same components is controlled by orifice plates. When the flow resistance of the two tanks deviates, it will cause uneven discharge from the tanks.

[0004] A search of patent literature revealed CN 105547661 A, which discloses a flow resistance matching acceptance test device and method for a conveying system. The device includes two simulated tanks, as well as a pump, valves, and a flow sensor connected to each other. The internal flow channels at the bottom of the simulated tanks are identical to those at the bottom of the tanks in the conveying system to be accepted. A differential pressure sensor connects the two simulated tanks. In operation, the bottom of one simulated tank is connected to the inlet of one branch pipe of the test piece, and the bottom of the other simulated tank is connected to the inlet of another branch pipe of the test piece. The pump inlet is connected to the outlet of the test piece. This patent primarily focuses on the structure and connection method of the test device, lacking in-depth and specific analysis of the underlying principles related to flow resistance, making accurate theoretical estimation and analysis difficult.

[0005] In summary, given the problems of the existing technologies, researching an analytical method and system for the impact of track control pipeline flow resistance deviation on the balanced discharge of storage tanks has become a critical task that urgently needs to be addressed. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the purpose of this invention is to provide an analysis method and system for the impact of track control pipeline flow resistance deviation on the balanced discharge of storage tanks.

[0007] The present invention provides a method for analyzing the impact of track control pipeline flow resistance deviation on tank balanced discharge, comprising the following steps:

[0008] The steps for setting up the object and device include setting up two surface tension tanks of the same component in parallel, labeled as tank #1 and tank #2 respectively, and setting up connecting pipelines;

[0009] The measurement setup steps include installing pressure sensors and differential pressure gauges to obtain initial data at each measurement point;

[0010] Analysis and calculation steps: Based on the initial data, perform flow resistance analysis and calculate the total flow resistance from the outlet of tank #1 and tank #2 to the inlet of the track control engine;

[0011] The relationship establishment steps involve analyzing the flow resistance components of ΔP1 from the outlet of tank #1 to the pipeline junction and ΔP2 from the outlet of tank #2 to the pipeline junction. The relationship between flow rate and flow resistance for each flow resistance component is listed. Using differential equations, the flow rate deviation caused by the deviation in flow resistance is analyzed under small deviation conditions, thereby estimating the unbalanced discharge of the two surface tension tanks.

[0012] Preferably, the object and device setup step includes the following sub-steps:

[0013] In the object setting sub-step, ensure that the gas and liquid circuits of tanks #1 and #2 are connected. Set the mass flow rate of the liquid circuit outlet of tank #1 to Q1 and the mass flow rate of the liquid circuit outlet of tank #2 to Q2. After connecting and merging, a pipeline with a total mass flow rate of Q3 is formed, and Q3 = Q1 + Q2 is satisfied. Then, the propellant is supplied to the inlet of the orbit control engine.

[0014] The device setup includes installing orifice plates at the liquid outlets of both tank #1 and tank #2, and setting valve modules downstream of the orifice plates. The outlets of the two valve modules are then connected via a tee.

[0015] Preferably, the valve module adopts a self-locking valve or an electric explosion valve.

[0016] Preferably, the measurement setup steps include: installing pressure sensors P1 and P2 at the outlets of tank #1 and tank #2 respectively; installing pressure sensor P3 at the pipeline junction; and installing pressure sensor P4 at the inlet of the track control engine. Simultaneously, a differential pressure gauge ΔP1 (ΔP1 = P1 - P3) is installed from the outlet of tank #1 to the pipeline junction to measure the flow resistance at the junction; a differential pressure gauge ΔP2 (ΔP2 = P2 - P3) is installed from the outlet of tank #2 to the pipeline junction to measure the flow resistance at the junction; and a differential pressure gauge ΔP3 (ΔP3 = P3 - P4) is installed from the pipeline junction to the track control engine inlet to measure the flow resistance at the junction.

[0017] Preferably, the analysis and calculation steps include the following sub-steps:

[0018] The analysis sub-steps for the flow resistance △P1 from the outlet of tank #1 to the pipeline junction include the flow resistance △P1j at orifice plate 1, the flow resistance △P1f at the valve module, and the flow resistance △P1g from the tank outlet to the pipeline junction. △P1=△P1j+△P1f+△P1g, where △P1g includes the pipeline friction flow resistance △P1gy and the local flow resistance △P1gj. △P1g=△P1gy+△P1gj. Therefore, △P1=△P1j+△P1f+△P1gy+△P1gj.

[0019] The analysis process for the flow resistance △P2 from the outlet of tank #2 to the pipeline junction includes the flow resistance △P2j at orifice plate 2, the flow resistance △P2f at valve module, and the flow resistance △P2g from the tank outlet to the pipeline junction. △P2=△P2j+△P2f+△P2g, where △P2g includes the pipeline friction flow resistance △P2gy and the local flow resistance △P2gj. △P2g=△P2gy+△P2gj. Therefore, △P2=△P2j+△P2f+△P2gy+△P2gj.

[0020] The analysis process for the flow resistance △P3 from the pipeline junction to the inlet of the track control engine includes the valve module flow resistance △P3f and the pipeline flow resistance △P3g, △P3=△P3f+△P3g, where △P3g includes the pipeline friction flow resistance △P3gy and the local flow resistance △P3gj, △P3g=△P3gy+△P3gj, therefore, △P3=△P3f+△P3gy+△P3gj;

[0021] The calculation sub-steps are as follows: the total flow resistance from the outlet of tank #1 to the inlet of the track control engine is calculated as Σ△P1=△P1+△P3; the total flow resistance from the outlet of tank #2 to the inlet of the track control engine is calculated as Σ△P2=△P2+△P3.

[0022] Preferably, the relationship establishment step includes the following sub-steps:

[0023] Step M1: Analyze the composition of flow resistance and list the relationship between flow rate and flow resistance for each flow resistance component;

[0024] Step M2: Combine the equations relating flow rate to flow resistance for each flow resistance component to obtain the combined equations.

[0025] Step M3: Calculate the unbalanced emissions based on the combined equations.

[0026] Preferably, in step M1, the relationship between the flow rate and the flow resistance for each flow resistance component is expressed as follows:

[0027] (1) The relationship between the flow resistance and flow rate of the orifice plate is as follows:

[0028]

[0029] Where: Q1 is the mass flow rate (kg / s) of tank #1 during operation;

[0030] C q The flow coefficient is dimensionless and depends on the shape and size of the orifice plate.

[0031] A is the area of ​​the throttling orifice (m²) 2 );

[0032] ρ is the density of the medium (kg / m³) 3 ).

[0033] Differentiating the above equation, we get:

[0034]

[0035] (2) The relationship between the flow resistance and flow rate of the valve module:

[0036] a) Assuming the valve is an electric explosion valve module, the valve's flow resistance is equal to the friction flow resistance of a pipeline of the same length.

[0037]

[0038] Where: λ is a function related to the Reynolds number, and it is assumed that the change in the value of λ is negligible and dimensionless under small flow deviations;

[0039] l – duct length, in meters (m);

[0040] d – Inner diameter of the duct, in meters (m);

[0041] ρ – Propellant density, in kilograms per cubic meter (kg / m³) 3 );

[0042] v – Propellant velocity, measured in meters per second (m / s).

[0043] Differentiating the above equation, we get:

[0044]

[0045] b) Assuming the valve is a self-locking valve module, the flow resistance of the valve can be estimated using the orifice plate flow resistance calculation formula. Based on the relationship between flow rate and flow resistance of the orifice plate, equation ② can also be obtained.

[0046] (3) The relationship between pipeline flow resistance and flow rate:

[0047] a) Pipeline friction resistance

[0048]

[0049] Differentiating the above equation, we get:

[0050]

[0051] b) Local flow resistance in the pipeline

[0052]

[0053] Where ξ is the local flow resistance coefficient, which is dimensionless.

[0054]

[0055] Differentiating the above equation, we get:

[0056]

[0057] Preferably, in step M2:

[0058] Combining equations ①, ②, ③, and ④, we get:

[0059]

[0060] Summarized as follows:

[0061]

[0062] Similarly:

[0063]

[0064] Preferably, in step M3, the uneven discharge amount of the parallel storage tanks under the condition of small deviation in the flow resistance of the track control pipeline is:

[0065]

[0066] This invention also provides an analysis system for the impact of track control pipeline flow resistance deviation on tank balanced discharge, comprising:

[0067] The object and device setting module sets up two surface tension tanks of the same component in parallel, labeled as tank #1 and tank #2 respectively, and sets up connecting pipelines;

[0068] The measurement setup module is equipped with pressure sensors and differential pressure gauges to acquire initial data at each measurement point;

[0069] The analysis and calculation module performs flow resistance analysis based on the initial data and calculates the total flow resistance from the outlet of tank #1 and tank #2 to the inlet of the track control engine.

[0070] The relationship establishment module analyzes the flow resistance components of the flow resistance ΔP1 from the outlet of tank #1 to the pipeline junction and the flow resistance ΔP2 from the outlet of tank #2 to the pipeline junction. It lists the relationship between the flow rate and the flow resistance for each flow resistance component and uses differential equations to calculate the flow rate deviation caused by the flow resistance deviation under small deviation conditions, thereby estimating the unbalanced discharge of the two tanks.

[0071] Compared with the prior art, the present invention has the following beneficial effects:

[0072] This invention, through in-depth analysis of the relationship between flow resistance deviation in orbit control pipelines and balanced discharge from propellant tanks, precisely dissects the unbalanced discharge rates of two propellant tanks with the same components under different flow resistance deviations. It not only provides a theoretical solution but also offers a reliable method for controlling unbalanced discharge in spacecraft propulsion systems. This effectively improves the stability and reliability of space systems, reduces potential risks caused by unbalanced discharge, and facilitates the smooth execution of space missions. It is of great significance in optimizing attitude and orbit control propulsion systems in the deep space domain and provides practical and effective solutions to related problems in aerospace engineering. Attached Figure Description

[0073] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0074] Figure 1 This is a schematic diagram of an analysis system for the impact of track control pipeline flow resistance deviation on the balanced discharge of storage tanks, according to an embodiment of the present invention.

[0075] Figure 2 This is a schematic diagram of a typical bicomponent constant pressure extrusion propulsion system in the background technology. Detailed Implementation

[0076] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0077] This invention relates to the field of attitude and orbit control propulsion systems in the aerospace deep space domain. In deep space, attitude and orbit control propulsion systems mostly employ a bi-component constant-pressure extrusion propulsion system, typically consisting of four tanks laid out in a horizontal configuration. Two tanks are filled with oxidizer, and the other two are filled with fuel. Given the stringent weight requirements of the overall probe system, surface tension tanks are usually selected for the propulsion system tanks, and a balanced emission target of better than 3% is required for the two parallel working tanks of the same component. Pipeline flow resistance deviation has a significant impact on balanced emission. This invention discloses an analytical method for the impact of pipeline flow resistance deviation on tank balanced emission. Using this method, the flow rate deviation between the two surface tension tanks of the same component, caused by the flow resistance deviation from the liquid outlet to the pipeline confluence, can be theoretically estimated, thereby allowing the calculation of the percentage of unbalanced emission. This provides a useful method for the analysis and control of unbalanced emission between two tanks of the same component in attitude and orbit control propulsion systems in the deep space domain.

[0078] The present invention proposes the following solution: Two surface tension storage tanks (1# and 2#) with the same components have interconnected gas and liquid circuits and identical air cushion pressures. The tanks have undergone flow resistance testing under rated flow conditions in stand-alone operation, and flow resistance data has been obtained. The two tanks with the same components are selected and matched based on this data. Therefore, controlling the flow resistance deviation between the outlet of the two tanks with the same components and the inlet of the track control engine is a crucial measure for controlling uneven emissions. Since the flow resistance from the pipeline junction to the track control engine inlet is the same for both circuits, controlling the flow resistance from the tank outlet to the pipeline junction is key. The flow resistance from the tank to the pipeline junction is divided into three parts: orifice plate flow resistance, valve module flow resistance, and pipeline flow resistance. Differential equations are used to determine the proportional relationship between the flow rate and flow resistance deviations of these three parts under small deviations, thereby calculating the uneven emissions from the two tanks.

[0079] Example 1:

[0080] This embodiment provides an analytical method for the impact of track control pipeline flow resistance deviation on tank-based balanced discharge, including the following steps:

[0081] The steps for setting up the object and device include setting up two surface tension tanks of the same component in parallel, labeled as tank #1 and tank #2 respectively, and setting up connecting pipelines;

[0082] Specifically, the object and device setup steps include the following sub-steps:

[0083] In the object setting sub-step, ensure that the gas and liquid lines of tanks #1 and #2 are connected. Set the mass flow rate of the liquid line outlet of tank #1 to Q1 and the mass flow rate of the liquid line outlet of tank #2 to Q2. After connecting and merging, a pipeline with a total mass flow rate of Q3 is formed, and Q3 = Q1 + Q2 is satisfied. Then, the propellant is supplied to the inlet of the orbit control engine.

[0084] The device setup includes installing orifice plates at the liquid outlets of both tank #1 and tank #2, and setting valve modules downstream of the orifice plates. The outlets of the two valve modules are then connected via a tee.

[0085] In this embodiment, the valve module adopts a self-locking valve or an electric explosion valve.

[0086] The measurement setup steps involve installing pressure sensors and differential pressure gauges to obtain initial data at each measurement point.

[0087] Specifically, pressure sensors P1 and P2 are installed at the outlets of tank #1 and tank #2, respectively; pressure sensor P3 is installed at the pipeline junction; and pressure sensor P4 is installed at the inlet of the track control engine. Simultaneously, a differential pressure gauge ΔP1 (ΔP1 = P1 - P3) is installed from the outlet of tank #1 to the pipeline junction to measure the flow resistance at this point. Similarly, a differential pressure gauge ΔP2 (ΔP2 = P2 - P3) is installed from the outlet of tank #2 to the pipeline junction to measure the flow resistance at this point. Finally, a differential pressure gauge ΔP3 (ΔP3 = P3 - P4) is installed from the pipeline junction to the inlet of the track control engine to measure the flow resistance at this point.

[0088] The analysis and calculation steps involve performing flow resistance analysis based on the initial data and calculating the total flow resistance from the outlet of tank #1 and tank #2 to the inlet of the track control engine.

[0089] Specifically, the analysis and calculation steps include the following sub-steps:

[0090] This embodiment uses an oxidant circuit as an example for illustration.

[0091] The analysis sub-steps for the flow resistance △P1 from the outlet of tank #1 to the pipeline junction include the flow resistance △P1j at the orifice plate 1, the flow resistance △P1f at the valve module, and the flow resistance △P1g from the tank outlet to the pipeline junction, where △P1=△P1j+△P1f+△P1g.

[0092] Among them, △P1g includes the pipe friction resistance △P1gy and the local flow resistance △P1gj, △P1g=△P1gy+△P1gj.

[0093] Therefore, △P1=△P1j+△P1f+△P1gy+△P1gj.

[0094] The analysis process for the flow resistance △P2 from the outlet of tank #2 to the pipeline junction includes the flow resistance △P2j at orifice plate 2, the flow resistance △P2f at valve module, and the flow resistance △P2g from the outlet of tank to the pipeline junction. △P2=△P2j+△P2f+△P2g.

[0095] Among them, △P2g includes the flow resistance along the pipeline △P2gy and the local flow resistance △P2gj, △P2g=△P2gy+△P2gj.

[0096] Therefore, △P2=△P2j+△P2f+△P2gy+△P2gj.

[0097] The analysis of the flow resistance ΔP3 from the pipeline junction to the track control engine inlet includes the valve module flow resistance ΔP3f and the pipeline flow resistance ΔP3g, where ΔP3 = ΔP3f + ΔP3g.

[0098] Among them, △P3g includes the pipe friction resistance △P3gy and the local flow resistance △P3gj, △P3g=△P3gy+△P3gj.

[0099] Therefore, △P3=△P3f+△P3gy+△P3gj.

[0100] The calculation sub-steps include: calculating the total flow resistance from the outlet of tank #1 to the inlet of the track control engine as Σ△P1=△P1+△P3; and the total flow resistance from the outlet of tank #2 to the inlet of the track control engine as Σ△P2=△P2+△P3. Thus, the difference between Σ△P1 and Σ△P2 mainly lies in the difference in flow resistance between △P1 and △P2.

[0101] The relationship establishment steps involve analyzing the flow resistance components of ΔP1 from the outlet of tank #1 to the pipeline junction and ΔP2 from the outlet of tank #2 to the pipeline junction. The relationship between flow rate and flow resistance for each flow resistance component is listed. By using differential equations, the flow rate deviation caused by the deviation in flow resistance under small deviation conditions is calculated, thereby estimating the unbalanced discharge of the two tanks.

[0102] The relationship establishment process includes the following sub-steps:

[0103] Step M1: Analyze the composition of flow resistance and list the relationship between flow rate and flow resistance for each flow resistance component.

[0104] Specifically, the relationship between flow rate and flow resistance for each flow resistance component is expressed as follows:

[0105] (1) The relationship between the flow resistance and flow rate of the orifice plate is as follows:

[0106]

[0107] Where: Q1 is the mass flow rate (kg / s) of tank #1 during operation;

[0108] C q The flow coefficient is dimensionless and depends on the shape and size of the orifice plate.

[0109] A is the area of ​​the throttling orifice (m²) 2 );

[0110] ρ is the density of the medium (kg / m³) 3 ).

[0111] Differentiating the above equation, we get:

[0112]

[0113] (2) The relationship between the flow resistance and flow rate of the valve module:

[0114] a) Assuming the valve is an electric explosion valve module, the valve's flow resistance is equal to the friction flow resistance of a pipeline of the same length.

[0115]

[0116] Where: λ is a function related to the Reynolds number, and it is assumed that the change in the value of λ is negligible and dimensionless under small flow deviations;

[0117] l – duct length, in meters (m);

[0118] d – Inner diameter of the duct, in meters (m);

[0119] ρ – Propellant density, in kilograms per cubic meter (kg / m³) 3 );

[0120] v – Propellant velocity, measured in meters per second (m / s).

[0121] Differentiating the above equation, we get:

[0122]

[0123] b) Assuming the valve is a self-locking valve module, the flow resistance of the valve can be estimated using the orifice plate flow resistance calculation formula. Based on the relationship between flow rate and flow resistance of the orifice plate, equation ② can also be obtained.

[0124] (3) The relationship between pipeline flow resistance and flow rate:

[0125] a) Pipeline friction resistance

[0126]

[0127] Differentiating the above equation, we get:

[0128]

[0129] b) Local flow resistance in the pipeline

[0130]

[0131] Where ξ is the local flow resistance coefficient, which is dimensionless.

[0132]

[0133] Differentiating the above equation, we get:

[0134]

[0135] Step M2 involves simultaneously solving the equations relating flow rate and flow resistance for each flow resistance component to obtain the combined equation.

[0136] Specifically, combining equations ①, ②, ③, and ④, we get:

[0137]

[0138] Summarized as follows:

[0139]

[0140] Similarly:

[0141]

[0142] Step M3: Calculate the unbalanced emissions based on the combined equations.

[0143] Specifically, under the condition of small deviation in the flow resistance of the track control pipeline, the uneven discharge of the parallel storage tanks is as follows:

[0144]

[0145] Example 2:

[0146] This embodiment uses the flow resistance debugging of a certain type of rail control pipeline as an example for illustration:

[0147] The flow resistance adjustment value at the junction of storage tank #1 and pipeline is ΔP1 = 0.164 MPa, and the flow resistance adjustment value at the junction of storage tank #2 and pipeline is ΔP2 = 0.168 MPa.

[0148] Assuming the deviation of the flow resistance adjustment value of the pipeline in tank #1 is dΔP1 = 0.005 MPa, then the deviation value of the flow rate is... The deviation of the flow resistance adjustment value dΔP2 for tank #2 is zero. Therefore, the imbalance in discharge between tanks #1 and #2 caused by the deviation of the flow resistance adjustment value dΔP1 in the pipeline of tank #1 is approximately 1.52%. Thus, controlling the flow resistance adjustment deviation at the pipeline junction between tanks #1 and #2 has a significant impact on balanced discharge.

[0149] Example 3:

[0150] Figure 1 This is a schematic diagram of an analysis system for the impact of track control pipeline flow resistance deviation on the balanced discharge of storage tanks, as described in an embodiment of the present invention.

[0151] like Figure 1 This embodiment provides an analysis system for the impact of track control pipeline flow resistance deviation on tank-based balanced discharge, including:

[0152] The object and device setting module sets up two surface tension tanks of the same component in parallel, labeled as tank #1 and tank #2 respectively, and sets up connecting pipelines;

[0153] The measurement setup module is equipped with pressure sensors and differential pressure gauges to acquire initial data at each measurement point;

[0154] The analysis and calculation module performs flow resistance analysis based on the initial data and calculates the total flow resistance from the outlet of tank #1 and tank #2 to the inlet of the track control engine.

[0155] The relationship establishment module analyzes the flow resistance components of the flow resistance ΔP1 from the outlet of tank #1 to the pipeline junction and the flow resistance ΔP2 from the outlet of tank #2 to the pipeline junction. It lists the relationship between the flow rate and the flow resistance for each flow resistance component and uses differential equations to calculate the flow rate deviation caused by the flow resistance deviation under small deviation conditions, thereby estimating the unbalanced discharge of the two tanks.

[0156] Those skilled in the art will understand that, besides implementing the system and its various devices, modules, and units provided by this invention in the form of purely computer-readable program code, the same functions can be achieved entirely through logical programming of the method steps, making the system and its various devices, modules, and units of this invention function in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers. Therefore, the system and its various devices, modules, and units provided by this invention can be considered as a hardware component, and the devices, modules, and units included therein for implementing various functions can also be considered as structures within the hardware component; alternatively, the devices, modules, and units for implementing various functions can be considered as both software modules implementing the method and structures within the hardware component.

[0157] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An analysis method for the influence of rail control pipeline flow resistance deviation on tank equalization discharge, characterized in that, The method comprises the following steps: An object and device setting step, setting two surface tension tanks of the same type in parallel, marked as 1# tank and 2# tank respectively, and setting a connecting pipeline; A measurement setting step, installing a pressure sensor and a differential pressure gauge for obtaining initial data of each measurement point; An analysis and calculation step, based on the initial data, analyzing flow resistance and calculating total flow resistance from the outlet of the 1# tank and the 2# tank to the inlet of the orbit control engine; A relationship establishing step, analyzing each flow resistance component of the flow resistance △P1 from the outlet of the 1# tank to the pipeline junction and the flow resistance △P2 from the outlet of the 2# tank to the pipeline junction, listing the relationship between the flow rate and the flow resistance of each flow resistance component respectively, and analyzing the flow rate deviation caused by the flow resistance deviation in the case of small deviation by using the differential equation, so as to estimate the unbalanced discharge of the two surface tension tanks.

2. The method according to claim 1, wherein the method is characterized in that: The object and device setting step comprises the following sub-steps: An object setting sub-step, ensuring that the gas path and the liquid path of the 1# tank and the 2# tank are connected, setting the mass flow rate of the liquid path outlet of the 1# tank as Q1, setting the mass flow rate of the liquid path outlet of the 2# tank as Q2, connecting and merging to form a pipeline with a total mass flow rate of Q3, and satisfying Q3=Q1+Q2, and supplying propellant to the inlet of the orbit control engine; A device setting sub-step, installing a throttle orifice plate at the liquid path outlet of the 1# tank and the 2# tank, setting a valve module downstream of the throttle orifice plate, and connecting and merging the outlets of the two valve modules through a tee joint.

3. The method of claim 2, wherein the method further comprises: determining the flow resistance of the rail control line; and determining the flow resistance of the rail control line at the time of the first and second events. The valve module adopts a self-locking valve or an electric explosion valve.

4. The method of claim 1, wherein the method further comprises: determining the flow resistance deviation of the rail control pipeline; and determining the influence of the flow resistance deviation of the rail control pipeline on the equalization discharge of the tank. The measurement setting step comprises the following steps: installing a pressure sensor P1 and a pressure sensor P2 at the outlet of the 1# tank and the 2# tank respectively, installing a pressure sensor P3 at the pipeline junction, and installing a pressure sensor P4 at the inlet of the orbit control engine; simultaneously, installing a differential pressure gauge △P1 at the outlet of the 1# tank to the pipeline junction, △P1=P1-P3, for measuring the flow resistance from the 1# tank to the pipeline junction; installing a differential pressure gauge △P2 at the outlet of the 2# tank to the pipeline junction, △P2=P2-P3, for measuring the flow resistance from the 2# tank to the pipeline junction; and installing a differential pressure gauge △P3 at the pipeline junction to the inlet of the orbit control engine, △P3=P3-P4, for measuring the flow resistance from the pipeline junction to the inlet of the orbit control engine.

5. The method of claim 1, wherein the method further comprises: determining the flow resistance deviation of the rail control pipeline; and determining the influence of the flow resistance deviation of the rail control pipeline on the equalization discharge of the tank. The analysis and calculation step comprises the following sub-steps: An analysis sub-step, for the analysis process of the flow resistance △P1 from the outlet of the 1# tank to the pipeline junction, including the flow resistance △P1j of the throttle orifice plate 1, the flow resistance △P1f of the valve module, and the flow resistance △P1g from the outlet of the tank to the pipeline junction, △P1=△P1j+△P1f+△P1g, wherein △P1g includes the flow resistance along the pipeline △P1gy and the local flow resistance △P1gj, △P1g=△P1gy+△P1gj, therefore, △P1=△P1j+△P1f+△P1gy+△P1gj; For the analysis of the flow resistance △P2 of the 2# tank outlet to the pipeline junction, including the flow resistance △P2j of the orifice plate 2, the flow resistance △P2f of the valve module, the flow resistance △P2g of the tank outlet to the pipeline junction, △P2 = △P2j + △P2f + △P2g, wherein △P2g includes the pipeline flow resistance △P2gy and the local flow resistance △P2gj, △P2g = △P2gy + △P2gj, therefore, △P2 = △P2j + △P2f + △P2gy + △P2gj; For the analysis of the flow resistance △P3 of the pipeline junction to the orbit control engine inlet, including the flow resistance △P3f of the valve module and the flow resistance △P3g of the pipeline, △P3 = △P3f + △P3g, wherein △P3g includes the pipeline flow resistance △P3gy and the local flow resistance △P3gj, △P3g = △P3gy + △P3gj, therefore, △P3 = △P3f + △P3gy + △P3gj; The calculation sub-step calculates the total flow resistance of the 1# tank outlet to the orbit control engine inlet as Σ△P1 = △P1 + △P3; and the total flow resistance of the 2# tank outlet to the orbit control engine inlet as Σ△P2 = △P2 + △P3.

6. The method of claim 1, wherein the method further comprises: determining the flow resistance of the rail control line; and determining the flow resistance of the tank. The relationship establishing step includes the following sub-steps: Step M1, analyzing the flow resistance components and listing the flow resistance and flow rate relationship of each flow resistance component; Step M2, performing simultaneous operation on the flow resistance and flow rate relationship of each flow resistance component to obtain the simultaneous equation; Step M3, calculating the unbalanced discharge amount based on the simultaneous equation.

7. The method of claim 6, wherein the method further comprises: determining the flow resistance of the rail control line; and determining the flow resistance of the rail control line based on the determined flow resistance of the rail control line. In the step M1, the flow resistance and flow rate relationship of each flow resistance component is shown as follows: (1) The flow resistance and flow rate relationship of the orifice plate is: Wherein: Q1 is the mass flow rate when the 1# tank is working; C q Cp Coefficient of discharge, dimensionless; Cp = Q / (A * sqrt(2 * g * h)) where Q = flow rate, A = area of orifice, g = gravitational constant, and h = pressure head. A is the orifice area; ρ is the medium density; The differential of the above formula is: (2) The flow resistance and flow rate relationship of the valve module is: a) Assuming that the valve is an electric explosion valve module, the flow resistance of the valve is equivalent to the pipeline flow resistance of the same length; Wherein: λ is a function related to the Reynolds number, which is considered to be negligible under a small flow rate deviation, dimensionless; l is the conduit length; d is the conduit inner diameter; ρ is the propellant density; v is the propellant flow rate; The differential of the above formula is: b) Assuming that the valve is a self-locking valve module, the flow resistance of the valve can be estimated by using the orifice plate flow resistance calculation formula; according to the flow resistance and flow rate relationship of the orifice plate, the same formula ② can be obtained; (3) The flow resistance and flow rate relationship of the pipeline is: a) Pipeline flow resistance The differential of the above formula is: b) Pipeline local flow resistance Wherein: ξ is the local flow resistance coefficient, dimensionless; The differential of the above formula is:

8. The method of claim 6, wherein the method further comprises: determining the flow resistance deviation of the rail control pipeline; and determining the influence of the flow resistance deviation of the rail control pipeline on the equalization discharge of the tank. In the step M2: The simultaneous equation of ①, ②, ③ and ④ is: After arrangement: Similarly:

9. The method for analyzing the impact of track control pipeline flow resistance deviation on tank balanced discharge according to claim 6, characterized in that, In the step M3, the unbalanced discharge amount of the parallel tank under the small deviation of the orbit control pipeline flow resistance is:

10. An analysis system for the influence of rail control pipeline flow resistance deviation on tank equalization discharge, characterized in that, Including: The object and device setting module sets two surface tension tanks of the same group element in parallel, which are marked as 1# tank and 2# tank respectively, and sets the connecting pipeline; The measurement setting module installs pressure sensors and pressure difference meters to obtain the initial data of each measurement point; The analysis and calculation module analyzes flow resistance and calculates total flow resistance from the 1# tank and the 2# tank outlet to the rail control engine inlet based on the initial data; The relationship establishment module analyzes each flow resistance component of the 1# tank outlet to the pipeline junction flow resistance ΔP1 and the 2# tank outlet to the pipeline junction flow resistance ΔP2, respectively lists the flow rate and flow resistance relationship of each flow resistance component, and solves the flow rate deviation caused by the flow resistance deviation in the case of small deviation through the way of differential equation, so as to estimate the unbalanced discharge of the two tanks.

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