Method and system for analyzing influence of flow resistance deviation of rail control pipeline on balanced discharge of storage tank

Abstract

The invention relates to the field of aerospace attitude and orbit control power systems, in the field, an attitude and orbit control power system mostly adopts a double-component constant-pressure extrusion type propelling system which is generally in a structural form that four storage tanks are flatly laid, two of the storage tanks are filled with an oxidizing agent, and the other two storage tanks are filled with fuel. A surface tension storage tank is usually selected as a propulsion system storage tank, and the balanced emission index requirement superior to 3% is provided for two parallel working storage tanks with the same component. And the flow resistance deviation of the pipeline has great influence on balanced discharge. The invention discloses a method and a system for analyzing influence of pipeline flow resistance deviation on balanced discharge of a storage tank. Through the method, the flow deviation of the two storage tanks caused by the flow resistance deviation from the liquid path outlets of the two surface tension storage tanks with the same component to the pipeline junction can be estimated theoretically, so that the percentage value of the unbalanced discharge amount can be calculated. A referential method is provided for analysis and control of the unbalanced discharge amount of two storage tanks of the same component of an attitude and orbit control power system in the deep space field.

Description

Technical Field

[0001] The present invention relates to the field of aerospace attitude and orbit control power systems, and in particular to a method and system for analyzing the influence of orbit control pipeline flow resistance deviation on tank balanced emission. Background Art

[0002] With the continuous development of aerospace technology, attitude and orbit control power systems are becoming increasingly lightweight and high-performance, especially in the deep space propulsion system. Due to the limited carrying capacity and the diversity of scientific exploration tasks, the overall requirements for the total weight of the probe are stringent. Similarly, the overall requirements for the dry weight of the propulsion system and the utilization rate of propellants are getting higher and higher. Dry weight control can achieve weight reduction through system solution configuration and structural optimization design; and improving the utilization rate of propellants is mainly manifested in two aspects: one is to improve the discharge efficiency of the tank; the other is to improve the balanced discharge of parallel tanks. At present, most tanks in the deep space field use large-volume surface tension tanks, and the discharge efficiency is generally not less than 99.5%, and there is little room for improvement. By improving the balanced discharge of parallel tanks, the utilization rate of propellants can be improved, the unusable amount of propellants can be reduced, and the deviation of the center of mass of the satellite or probe can be reduced, thereby reducing the interference torque and unnecessary propellant consumption. Taking a certain deep space model as an example, the total propellant filling amount is about 3000kg, the oxidizer filling amount is about 1868kg, and the filling amount of a single oxidizer tank is 934kg; the fuel filling amount is about 1132kg, and the filling amount of a single fuel tank is 566kg. If the balanced emission index of the oxidizer or fuel tank can be increased by 1%, 9.34kg of oxidizer (or 5.66kg of fuel) can be saved, which is of great benefit to the system weight reduction, center of mass stability and control of interference torque, or it is also crucial to constrain the balanced emission index within the overall technical index through analysis and control means. According to the statistics of model flight tests, the orbit control engine of the deep space probe propulsion system generally consumes 80% to 90% of the propellant filling amount on orbit, and the flow resistance deviation of the orbit control pipeline is an important factor affecting the balanced emission of parallel tanks. Therefore, it is very meaningful to estimate the deviation value of the tank imbalance caused by the deviation of the flow resistance of the derailment control pipeline through theoretical analysis, and use this value as one of the important bases for debugging the flow resistance of the actual rail control pipeline to achieve the goal of reducing unbalanced emissions.

[0003] In the deep space field, attitude and orbit control power systems mostly use a bipropellant constant pressure extrusion propulsion system, which is usually a flat structure with four tanks, two filled with oxidizer and two filled with fuel. The tanks are generally surface tension tanks, and the gas and liquid paths of the tanks of the same component are connected during in-orbit flight. The schematic diagram of the principle of a typical bipropellant constant pressure extrusion propulsion system is shown in Figure 2As shown. The pressurized gas is transported to the oxidizer and fuel tanks through pipelines. The gas and liquid circuits of the two oxidizer and fuel tanks are connected. After the gas enters the tank, it squeezes the propellant and passes through the throttling orifice plate, liquid circuit valve module and track and attitude control pipelines to transport the propellant to the front of the orbit control engine and attitude control engine solenoid valve. When the orbit control and attitude control engines need to be ignited, the corresponding solenoid valves are opened to generate thrust. In general, the flow resistance of the orbit control pipeline of the two tanks of the same component is controlled by the throttling orifice plate. When the flow resistance of the two tanks deviates, it will cause unbalanced discharge of the tanks.

[0004] Through searching patent documents, it is found that CN 105547661 A provides a conveying system flow resistance matching acceptance test device and its test method. The device includes two simulated tanks, and also includes a pump, a valve and a flow sensor that are interconnected. The internal flow channel at the bottom of the simulated tank is consistent with the internal flow channel at the bottom of the tank in the conveying system that needs to be accepted. A pressure difference sensor is connected between the two simulated tanks. In the use state, the bottom of one simulated tank is connected to the inlet of a 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, and the inlet of the pump is connected to the outlet of the test piece. This patent mainly focuses on the structure and connection method of the test device, and the principle analysis related to flow resistance is not in-depth and specific enough, making it difficult to achieve accurate theoretical estimation and analysis.

[0005] In summary, in view of the above-mentioned problems of the prior art, studying an analysis method and system for the impact of rail control pipeline flow resistance deviation on tank balanced emission has become a key task that needs to be solved urgently. Summary of the invention

[0006] In view of the defects in the prior art, the purpose of the present invention is to provide a method and system for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced emission of the tank.

[0007] According to the present invention, a method for analyzing the influence of the flow resistance deviation of a rail control pipeline on the balanced discharge of a tank comprises the following steps:

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

[0009] Measurement setup steps, 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, flow resistance analysis is performed and the total flow resistance from the outlet of the 1# tank and the 2# tank to the inlet of the rail control engine is calculated;

[0011] In the relationship establishment step, the flow resistance components of the flow resistance △P1 from the outlet of the 1# tank to the confluence of the pipeline and the flow resistance △P2 from the outlet of the 2# tank to the confluence of the pipeline are analyzed, and the relationship between the flow rate and the flow resistance of each flow resistance component is listed respectively. The differential equation method is used to analyze the flow deviation caused by the deviation of the flow resistance in the case of small deviation, so as to estimate the unbalanced discharge of the two surface tension tanks.

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

[0013] The object setting sub-step ensures that the gas and liquid circuits of the 1# tank and the 2# tank are connected, and the mass flow rate of the liquid circuit outlet of the 1# tank is set to Q1, and the mass flow rate of the liquid circuit outlet of the 2# tank is set to Q2. After the connection and merging, the total mass flow rate of a pipeline is Q3, and Q3=Q1+Q2 is satisfied, and the propellant is supplied to the inlet of the orbital control engine;

[0014] The device setting sub-step is to install throttling orifice plates at the liquid outlets of the 1# storage tank and the 2# storage tank, and to set a valve module downstream of the throttling orifice plates, and to connect the outlets of the two valve modules through a tee.

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

[0016] Preferably, the measurement setting step includes: installing a pressure sensor P1 and a pressure sensor P2 at the outlets of the 1# tank and the 2# tank, respectively, installing a pressure sensor P3 at the confluence of the pipelines, and installing a pressure sensor P4 at the inlet of the track control engine; at the same time, installing a differential pressure gauge △P1 from the outlet of the 1# tank to the confluence of the pipelines, △P1=P1-P3, for measuring the flow resistance from the 1# tank to the confluence of the pipelines; installing a differential pressure gauge △P2 from the outlet of the 2# tank to the confluence of the pipelines, △P2=P2-P3, for measuring the flow resistance from the 2# tank to the confluence of the pipelines; installing a differential pressure gauge △P3 from the confluence of the pipelines to the inlet of the track control engine, △P3=P3-P4, for measuring the flow resistance from the confluence of the pipelines to the inlet of the track control engine.

[0017] Preferably, the analyzing and calculating step includes the following sub-steps:

[0018] The analysis sub-step includes the analysis process of the flow resistance △P1 from the outlet of the 1# tank to the confluence of the pipeline, including the flow resistance △P1j at the throttling orifice plate 1, the flow resistance △P1f of the valve module, and the flow resistance △P1g from the outlet of the tank to the confluence of the pipeline, △P1=△P1j+△P1f+△P1g, wherein △P1g includes the flow resistance △P1gy along the pipeline and the local flow resistance △P1gj, △P1g=△P1gy+△P1gj, therefore, △P1=△P1j+△P1f+△P1gy+△P1gj;

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

[0020] The analysis process of the flow resistance △P3 from the confluence of the pipelines to the inlet of the rail control engine includes the flow resistance △P3f of the valve module and the flow resistance △P3g of the pipeline, △P3=△P3f+△P3g, wherein △P3g includes the flow resistance along the pipeline △P3gy and the local flow resistance △P3gj, △P3g=△P3gy+△P3gj, therefore, △P3=△P3f+△P3gy+△P3gj;

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

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

[0023] Step M1, analyzing the flow resistance composition and listing the relationship between the flow rate and the flow resistance of each flow resistance component;

[0024] Step M2, performing a simultaneous operation on the relationship between the flow rate of each flow resistance component and the flow resistance to obtain a simultaneous equation;

[0025] Step M3, calculating the unbalanced emission based on the combined equations.

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

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

[0028]

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

[0030] C q is the flow coefficient related to the shape and size of the throttling orifice plate, dimensionless;

[0031] A is the orifice area (m 2 );

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

[0033] Differentiating the above formula gives:

[0034]

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

[0036] a) Assuming that the valve is an electric explosion valve module, the flow resistance of the valve is equivalent to the flow resistance along the pipeline of the same length.

[0037]

[0038] Where: λ is a function related to the Reynolds number. It is considered that under small flow deviation, the numerical change of λ can be ignored and is dimensionless;

[0039] l - catheter length, in meters (m);

[0040] d - inner diameter of the catheter, in meters (m);

[0041] ρ - propellant density, in kilograms per cubic meter (kg / m 3 );

[0042] v - propellant flow rate, in meters per second (m / s).

[0043] Differentiating the above formula gives:

[0044]

[0045] b) Assuming that the valve is a self-locking valve module, the flow resistance of the valve can be estimated by using the throttling orifice flow resistance calculation formula. According to the relationship between the flow rate and flow resistance of the throttling orifice, formula ② can also be obtained.

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

[0047] a) Flow resistance along the pipeline

[0048]

[0049] Differentiating the above formula gives:

[0050]

[0051] b) Local flow resistance of pipeline

[0052]

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

[0054]

[0055] Differentiating the above formula gives:

[0056]

[0057] Preferably, in step M2:

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

[0059]

[0060] Arranged:

[0061]

[0062] Similarly:

[0063]

[0064] Preferably, in step M3, the unbalanced discharge amount of the parallel tanks when the flow resistance of the rail control pipeline is small is:

[0065]

[0066] The present invention also provides an analysis system for the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank, comprising:

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

[0068] The measurement setup module is equipped with pressure sensors and differential pressure gauges to obtain 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 the 1# tank and the 2# tank to the inlet of the rail control engine;

[0070] The relationship building module analyzes the various flow resistance components of the flow resistance △P1 from the outlet of the 1# tank to the pipeline confluence and the flow resistance △P2 from the outlet of the 2# tank to the pipeline confluence, and lists the relationship between the flow rate and the flow resistance of each flow resistance component. By means of differential equations, the flow deviation caused by the deviation of the flow resistance in the case of a small deviation is calculated, thereby estimating the unbalanced emissions of the two tanks.

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

[0072] The present invention, through an in-depth analysis of the relationship between the flow resistance deviation of the orbit control pipeline and the balanced emission of the tank, accurately analyzes the unbalanced emissions of two tanks of the same component under different flow resistance deviations. It not only provides a theoretical solution, but also provides a reliable method for controlling unbalanced emissions of spacecraft propulsion systems. It can effectively improve the stability and reliability of aerospace systems, reduce potential risks caused by unbalanced emissions, and help aerospace missions proceed smoothly. It is of great significance in the optimization of attitude and orbit control power systems in the deep space field of aerospace, and provides a practical and effective solution to problems related to aerospace engineering. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0074] Figure 1 A schematic diagram of an analysis system for the effect of a flow resistance deviation of a rail control pipeline on balanced discharge of a tank in an embodiment of the present invention;

[0075] Figure 2 It is a schematic diagram of the principle of a typical bicomponent constant pressure extrusion propulsion system in the background technology. DETAILED DESCRIPTION

[0076] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0077] The present invention relates to the field of attitude and orbit control power systems in the field of aerospace deep space. In the field of deep space, attitude and orbit control power systems mostly adopt a dual-component constant-pressure extrusion propulsion system, which is generally a structure in which four tanks are laid flat, two of which are filled with oxidizers and the other two are filled with fuel. In view of the strict weight index requirements of the overall detector on the propulsion system, the structure of the propulsion system tank is usually selected as a surface tension tank, and a balanced emission index requirement of better than 3% is proposed for two parallel working tanks of the same component. The influence of pipeline flow resistance deviation on balanced emission is relatively large. The present invention discloses a method for analyzing the influence of pipeline flow resistance deviation on tank balanced emission. Through this method, the flow deviation of two tanks caused by the flow resistance deviation from the liquid outlet of two surface tension tanks of the same component to the confluence of the pipeline can be theoretically estimated, so that the percentage value of the unbalanced emission can be calculated. It provides a reference method for analyzing and controlling the unbalanced emission of two tanks of the same component in the attitude and orbit control power system in the deep space field.

[0078] The scheme of the present invention is as follows: the gas and liquid paths of the two surface tension tanks (1# and 2#) of the same component are connected, the air cushion pressure is the same, the tanks have been tested for flow resistance under rated flow conditions in a single-machine state, and the flow resistance data has been obtained. The two tanks of the same component will be selected according to the flow resistance data. Therefore, controlling the flow resistance deviation from the outlet of the two tanks of the same component to the inlet of the track control engine is an important measure to control the unbalanced emission. Since the flow resistance from the confluence of the pipelines to the inlet of the track control engine is the same for the two routes, it is key to control the flow resistance from the tank outlet to the confluence of the pipelines. The flow resistance from the tank to the confluence of the pipelines is divided into three parts: the throttling orifice flow resistance, the valve module flow resistance and the pipeline flow resistance. The differential equation method is used to find the deviation proportional relationship between the flow rate and the flow resistance of the three parts under the condition of small deviation, thereby calculating the emission imbalance of the two tanks.

[0079] Embodiment 1:

[0080] This embodiment provides a method for analyzing the impact of rail control pipeline flow resistance deviation on tank balanced discharge, comprising the following steps:

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

[0082] Specifically, the object and device setting step includes the following sub-steps:

[0083] The object setting sub-step ensures that the gas and liquid circuits of tank 1# and tank 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 the connection and merging, a total mass flow rate of a pipeline is formed, which is Q3, and satisfies Q3=Q1+Q2, and the propellant is supplied to the entrance of the orbital control engine.

[0084] The device setting sub-step is to install throttling orifice plates at the liquid outlets of the 1# storage tank and the 2# storage tank, and to set a valve module downstream of the throttling orifice plates, and to connect the outlets of the two valve modules through a tee.

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

[0086] Measurement setup steps, installing the pressure sensor and differential pressure gauge to obtain initial data for each measurement point.

[0087] Specifically, pressure sensor P1 and pressure sensor P2 are installed at the outlets of the 1# tank and the 2# tank respectively, pressure sensor P3 is installed at the confluence of the pipelines, and pressure sensor P4 is installed at the inlet of the track control engine; at the same time, a differential pressure gauge △P1 is installed from the outlet of the 1# tank to the confluence of the pipelines, △P1=P1-P3, for measuring the flow resistance from the 1# tank to the confluence of the pipelines; a differential pressure gauge △P2 is installed from the outlet of the 2# tank to the confluence of the pipelines, △P2=P2-P3, for measuring the flow resistance from the 2# tank to the confluence of the pipelines; a differential pressure gauge △P3 is installed from the confluence of the pipelines to the inlet of the track control engine, △P3=P3-P4, for measuring the flow resistance from the confluence of the pipelines to the inlet of the track control engine.

[0088] Analysis and calculation steps: Based on the initial data, flow resistance analysis is performed and the total flow resistance from the outlet of the 1# tank and the 2# tank to the inlet of the rail control engine is calculated.

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

[0090] This embodiment is described by taking the oxidant circuit as an example.

[0091] The analysis sub-step is for analyzing the flow resistance △P1 from the outlet of the 1# tank to the confluence of the pipeline, including the flow resistance △P1j at the throttling orifice plate 1, the flow resistance △P1f of the valve module, and the flow resistance △P1g from the outlet of the tank to the confluence of the pipeline, △P1=△P1j+△P1f+△P1g.

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

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

[0094] The analysis process of the flow resistance △P2 from the 2# tank outlet to the pipeline junction includes the flow resistance △P2j at the throttling orifice plate 2, the flow resistance △P2f of the valve module, and the flow resistance △P2g from the tank outlet 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 process of the flow resistance △P3 from the confluence of the pipelines to the inlet of the rail control engine includes the valve module flow resistance △P3f and the pipeline flow resistance △P3g, △P3=△P3f+△P3g,

[0098] Among them, △P3g includes the flow resistance along the pipeline △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 the 1# tank to the inlet of the rail control engine as Σ△P1=△P1+△P3; the total flow resistance from the outlet of the 2# tank to the inlet of the rail control engine as Σ△P2=△P2+△P3. It is thus concluded that the difference between Σ△P1 and Σ△P2 is mainly reflected in the difference in flow resistance between △P1 and △P2.

[0101] In the relationship establishment step, the flow resistance components of the flow resistance △P1 from the outlet of the 1# tank to the confluence of the pipeline and the flow resistance △P2 from the outlet of the 2# tank to the confluence of the pipeline are analyzed, and the relationship between the flow rate and the flow resistance of each flow resistance component is listed respectively. Through the differential equation method, the flow deviation caused by the deviation of the flow resistance in the case of a small deviation is calculated, thereby estimating the unbalanced emissions of the two tanks.

[0102] The relationship building step includes the following sub-steps:

[0103] Step M1, analyzing the flow resistance composition and listing the relationship between the flow rate and the flow resistance of each flow resistance component.

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

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

[0106]

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

[0108] C q is the flow coefficient related to the shape and size of the throttling orifice plate, dimensionless;

[0109] A is the orifice area (m 2 );

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

[0111] Differentiating the above formula gives:

[0112]

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

[0114] a) Assuming that the valve is an electric explosion valve module, the flow resistance of the valve is equivalent to the flow resistance along the pipeline of the same length.

[0115]

[0116] Where: λ is a function related to the Reynolds number. It is considered that under small flow deviation, the numerical change of λ can be ignored and is dimensionless;

[0117] l - catheter length, in meters (m);

[0118] d - inner diameter of the catheter, in meters (m);

[0119] ρ - propellant density, in kilograms per cubic meter (kg / m 3 );

[0120] v - propellant flow rate, in meters per second (m / s).

[0121] Differentiating the above formula gives:

[0122]

[0123] b) Assuming that the valve is a self-locking valve module, the flow resistance of the valve can be estimated by using the throttling orifice flow resistance calculation formula. According to the relationship between the flow rate and flow resistance of the throttling orifice, formula ② can also be obtained.

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

[0125] a) Flow resistance along the pipeline

[0126]

[0127] Differentiating the above formula gives:

[0128]

[0129] b) Local flow resistance of pipeline

[0130]

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

[0132]

[0133] Differentiating the above formula gives:

[0134]

[0135] Step M2, performing a combined operation on the relationship between the flow rate of each flow resistance component and the flow resistance to obtain a combined equation.

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

[0137]

[0138] Arranged:

[0139]

[0140] Similarly:

[0141]

[0142] Step M3, calculating the unbalanced emission based on the combined equations.

[0143] Specifically, the unbalanced discharge of parallel tanks when the flow resistance of the rail control pipeline is small is:

[0144]

[0145] Embodiment 2:

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

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

[0148] Assuming that the flow resistance adjustment value deviation of the 1# tank pipeline is dΔP1=0.005MPa, the flow deviation value is The 2# flow resistance adjustment value deviation dΔP2 is zero. Then the discharge imbalance between 1# and 2# tanks caused by the 1# tank pipeline flow resistance adjustment value deviation dΔP1 is about 1.52%. Therefore, how to control the flow resistance adjustment deviation from 1# and 2# tanks to the confluence of the pipeline has a great impact on balanced discharge.

[0149] Embodiment 3:

[0150] Figure 1 Schematic diagram of an analysis system for the effect of a rail control pipeline flow resistance deviation on balanced tank discharge in an embodiment of the present invention.

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

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

[0153] The measurement setup module is equipped with pressure sensors and differential pressure gauges to obtain 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 the 1# tank and the 2# tank to the inlet of the rail control engine;

[0155] The relationship building module analyzes the various flow resistance components of the flow resistance △P1 from the outlet of the 1# tank to the pipeline confluence and the flow resistance △P2 from the outlet of the 2# tank to the pipeline confluence, and lists the relationship between the flow rate and the flow resistance of each flow resistance component. By means of differential equations, the flow deviation caused by the deviation of the flow resistance in the case of a small deviation is calculated, thereby estimating the unbalanced emissions of the two tanks.

[0156] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0157] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank, characterized in that: The steps include: The object and device setting steps include setting two surface tension tanks of the same component in parallel, marked as 1# tank and 2# tank, and setting connecting pipelines; Measurement setup steps, installing pressure sensors and differential pressure gauges to obtain initial data at each measurement point; An analysis and calculation step, based on the initial data, performing a flow resistance analysis and calculating a total flow resistance from the outlet of the No. 1 tank and the No. 2 tank to the inlet of the rail control engine; In the relationship establishing step, the flow resistance components of the flow resistance △P1 from the outlet of the 1# tank to the confluence of the pipeline and the flow resistance △P2 from the outlet of the 2# tank to the confluence of the pipeline are analyzed, and the relationship between the flow rate of each flow resistance component and the flow resistance is listed respectively. The flow deviation caused by the deviation of the flow resistance is analyzed in the case of a small deviation by means of differential equations, so as to estimate the unbalanced discharge of the two surface tension tanks.

2. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 1, characterized in that: The object and device setting step includes the following sub-steps: The object setting sub-step ensures that the gas and liquid circuits of the 1# tank and the 2# tank are connected, sets the mass flow rate of the outlet of the liquid circuit of the 1# tank to Q1, and the mass flow rate of the outlet of the liquid circuit of the 2# tank to Q2, and the total mass flow rate of a pipeline formed after the connection and merging is Q3, and satisfies Q3=Q1+Q2, and supplies the propellant to the inlet of the orbital control engine; The device setting sub-step is to install throttling orifice plates at the liquid outlets of the 1# storage tank and the 2# storage tank, and to set a valve module downstream of the throttling orifice plates, and to connect the two valve module outlets through a tee.

3. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 2, characterized in that: The valve module adopts a self-locking valve or an electric explosion valve.

4. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 1, characterized in that: The measurement setting step includes: installing a pressure sensor P1 and a pressure sensor P2 at the outlets of the No. 1 tank and the No. 2 tank respectively, installing a pressure sensor P3 at the confluence of the pipelines, and installing a pressure sensor P4 at the inlet of the track control engine; at the same time, installing a differential pressure gauge △P1 at the outlet of the No. 1 tank to the confluence of the pipelines, △P1=P1-P3, for measuring the flow resistance from the No. 1 tank to the confluence of the pipelines; installing a differential pressure gauge △P2 at the outlet of the No. 2 tank to the confluence of the pipelines, △P2=P2-P3, for measuring the flow resistance from the No. 2 tank to the confluence of the pipelines; installing a differential pressure gauge △P3 from the confluence of the pipelines to the inlet of the track control engine, △P3=P3-P4, for measuring the flow resistance from the confluence of the pipelines to the inlet of the track control engine.

5. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 1, characterized in that: The analysis and calculation steps include the following sub-steps: The analysis sub-step includes the analysis process of the flow resistance △P1 from the outlet of the 1# tank to the confluence of the pipeline, including the flow resistance △P1j at the throttling orifice plate 1, the flow resistance △P1f of the valve module, and the flow resistance △P1g from the outlet of the tank to the confluence of the pipeline, △P1=△P1j+△P1f+△P1g, wherein △P1g includes the flow resistance △P1gy along the pipeline and the local flow resistance △P1gj, △P1g=△P1gy+△P1gj, therefore, △P1=△P1j+△P1f+△P1gy+△P1gj; The analysis process of the flow resistance △P2 from the outlet of the 2# tank to the confluence of the pipeline includes the flow resistance △P2j at the throttling orifice plate 2, the flow resistance △P2f of the valve module, and the flow resistance △P2g from the outlet of the tank to the confluence of the pipeline, △P2=△P2j+△P2f+△P2g, wherein △P2g includes the flow resistance △P2gy along the pipeline and the local flow resistance △P2gj, △P2g=△P2gy+△P2gj, therefore, △P2=△P2j+△P2f+△P2gy+△P2gj; The analysis process of the flow resistance △P3 from the confluence of the pipelines to the inlet of the rail control engine includes the flow resistance △P3f of the valve module and the flow resistance △P3g of the pipeline, △P3=△P3f+△P3g, wherein △P3g includes the flow resistance along the pipeline △P3gy and the local flow resistance △P3gj, △P3g=△P3gy+△P3gj, therefore, △P3=△P3f+△P3gy+△P3gj; In a calculation sub-step, a total flow resistance from the outlet of the No. 1 tank to the inlet of the track control engine is calculated as Σ△P1=△P1+△P3; and a total flow resistance from the outlet of the No. 2 tank to the inlet of the track control engine is calculated as Σ△P2=△P2+△P3.

6. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 1, characterized in that: The relationship establishment step includes the following sub-steps: Step M1, analyzing the flow resistance composition and listing the relationship between the flow rate and the flow resistance of each flow resistance component; Step M2, performing a simultaneous operation on the relationship between the flow rate of each flow resistance component and the flow resistance to obtain a simultaneous equation; Step M3, calculating the unbalanced emission based on the combined equations.

7. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 6, characterized in that: In step M1, the relationship between the flow rate of each flow resistance component and the flow resistance is expressed as follows: (1) The relationship between the flow resistance and flow rate of the throttling orifice is: Where: Q1 is the mass flow rate of 1# tank when it is working; C q is the flow coefficient related to the shape and size of the throttling orifice plate, dimensionless; A is the area of ​​the throttle hole; ρ is the medium density; Differentiating the above formula gives: (2) The relationship between the flow resistance and flow rate of the valve module: a) Assuming that the valve is an electric explosion valve module, the flow resistance of the valve is equivalent to the flow resistance along the pipeline of the same length; Where: λ is a function related to the Reynolds number. It is considered that under small flow deviation, the numerical change of λ can be ignored and is dimensionless; l - catheter length; d - inner diameter of the catheter; ρ – propellant density; v – propellant flow rate; Differentiating the above formula gives: b) Assuming that the valve is a self-locking valve module, the flow resistance of the valve can be estimated by using the throttling orifice flow resistance calculation formula; according to the relationship between the flow rate and flow resistance of the throttling orifice, formula ② can also be obtained; (3) The relationship between pipeline flow resistance and flow rate: a) Flow resistance along the pipeline Differentiating the above formula gives: b) Local flow resistance of pipeline Where ξ is the local flow resistance coefficient, dimensionless; Differentiating the above formula gives:

8. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 6, characterized in that: In the step M2: Combining equations ①, ②, ③ and ④, we get: Arranged: Similarly:

9. The method for analyzing the influence of the flow resistance deviation of the rail control pipeline on the balanced discharge of the tank according to claim 6, characterized in that: In step M3, the unbalanced discharge of the parallel tanks when the flow resistance of the rail control pipeline has a small deviation is:

10. An analysis system for the effect of rail control pipeline flow resistance deviation on tank balanced discharge, characterized in that: include: The object and device setting module sets two surface tension tanks of the same component in parallel, marked as 1# tank and 2# tank, and sets connecting pipelines; The measurement setup module is equipped with pressure sensors and differential pressure gauges to obtain initial data at each measurement point; An analysis and calculation module, based on the initial data, performs flow resistance analysis and calculates the total flow resistance from the outlet of the No. 1 tank and the No. 2 tank to the inlet of the rail control engine; The relationship building module analyzes the flow resistance components of the flow resistance △P1 from the outlet of the 1# tank to the confluence of the pipelines and the flow resistance △P2 from the outlet of the 2# tank to the confluence of the pipelines, lists the relationship between the flow rate of each flow resistance component and the flow resistance respectively, and calculates the flow deviation caused by the deviation of the flow resistance in the case of a small deviation through a differential equation, thereby estimating the unbalanced emissions of the two tanks.

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