A digital valve flow control unit data analysis method

Abstract

The present application belongs to the field of experimental aerodynamics, and discloses a data analysis method of a digital valve flow control unit. The data analysis method of the digital valve flow control unit comprises installing a digital valve system, installing a sensor, performing a flow measurement test, and calculating the outlet flow of the digital valve system. The data analysis method of the digital valve flow control unit is based on the basic equations of fluid mechanics, and through strict theoretical derivation and flow measurement test verification, a data processing and analysis method of the digital valve flow control unit is established, which provides test and theoretical support for accurate control of high-pressure air flow and has engineering application value.

Description

Technical Field

[0001] This invention belongs to the field of experimental aerodynamics, specifically relating to a data analysis method for a digital valve flow control unit. Background Technology

[0002] Wind tunnel testing is the most widely used, effective, mature, and comprehensive experimental aerodynamics research method. Through various types of wind tunnel tests, flow parameters can be obtained, complex flow phenomena can be understood, and highly reliable evidence can be provided for establishing realistic mathematical models in basic research and engineering application research. It plays an important role in the integrated fine design and aerodynamic characteristic evaluation of advanced aircraft aerodynamics / structure / propulsion.

[0003] Dynamic simulation wind tunnel testing is an important verification method for integrated aircraft-engine design. Tests such as jet flow and TPS (Total Power Stream) require precise control of high-pressure air supply flow, placing high demands on digital valve systems. Existing digital valve systems generally use critical flow Venturi nozzles as flow control units; however, the lack of rigorous theoretical support for their data analysis methods severely limits the accuracy of high-pressure air supply flow control in dynamic simulation wind tunnel tests, adversely affecting the integrated aircraft-engine design.

[0004] Currently, there is an urgent need to develop a data analysis method for digital valve flow control units. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a data analysis method for a digital valve flow control unit, so as to overcome the defects of the prior art.

[0006] The data analysis method for the digital valve flow control unit of the present invention includes the following steps:

[0007] S10. Install a digital valve system;

[0008] The digital valve system consists of a digital valve system inlet, a pressure regulating valve, a digital valve flow control unit, and a digital valve system outlet. The high-pressure air source is connected to the digital valve system inlet, and the digital valve system outlet is connected to the flow-demanding equipment.

[0009] S20. Install the sensor;

[0010] The digital valve flow control unit adopts a critical flow venturi nozzle design, and a total pressure sensor and a total temperature sensor are installed before the digital valve flow control unit.

[0011] S30. Conduct a flow measurement test;

[0012] Turn on the high-pressure air supply and measure the total pressure before the digital valve flow control unit. Total temperature ;

[0013] S40. Calculate the outlet flow rate of the digital valve system. ;

[0014] Based on the total pressure before the digital valve flow control unit Total temperature Calculate the outlet flow of the digital valve system :

[0015] ;

[0016] In the formula, The critical flow Venturi nozzle throat area for the digital valve flow control unit; The outflow coefficient, The critical flow function for one-dimensional isentropic flow is obtained by calibration of the critical flow Venturi nozzle of the digital valve flow control unit. Let be the gas constant of air. .

[0017] Furthermore, S40 includes the following steps:

[0018] S41. Analyze the flow state of the critical flow venturi nozzle throat of the digital valve flow control unit;

[0019] The flow in the critical flow Venturi nozzle of the digital valve flow control unit is a one-dimensional isentropic variable cross-section flow, and the continuity equation and momentum equation are as follows:

[0020] Continuity equation: ;

[0021] Momentum equation: ;

[0022] In the formula, For differential operators, Let be the air density at any cross-section. Let V be the airflow velocity at any cross-section. The flow area at any cross-section;

[0023] According to Mach number and speed of sound Definition:

[0024] ;

[0025] In the formula, Let be the static air pressure at any cross-section. The specific heat ratio of air. The static air temperature at any cross-section;

[0026] Simultaneously solve the continuity equation, momentum equation, and Mach number equation for one-dimensional isentropic flow. and speed of sound By defining the relationship between the flow area and the air velocity at any cross section of a one-dimensional isentropic flow, we obtain the following equation:

[0027] ;

[0028] According to the relationship between the flow area and air velocity at any cross section of a one-dimensional isentropic variable cross-section flow, when the air flows at subsonic speeds... hour, This is consistent with the flow state before the throat in the critical flow Venturi nozzle of the digital valve flow control unit; when the air flows at supersonic speed... hour, The flow state after the throat in the critical flow Venturi nozzle of the digital valve flow control unit is consistent with that in the digital valve flow control unit. Based on the continuity of one-dimensional isentropic variable cross-section flow, the Mach number at the throat of the critical flow Venturi nozzle of the digital valve flow control unit is... ;

[0029] S42. Establish a digital valve flow control unit to handle the critical flow rate of the Venturi nozzle throat. Relationship;

[0030] Digital valve flow control unit critical flow Venturi nozzle throat treatment ideal flow The expression:

[0031] ;

[0032] In the formula, The critical flow air density at the throat of the Venturi nozzle in the digital valve flow control unit. The critical flow velocity of the airflow at the throat of the Venturi nozzle of the digital valve flow control unit;

[0033] The total static pressure relationship at the throat of the critical flow venturi nozzle in the digital valve flow control unit is as follows:

[0034] ;

[0035] In the formula, The static air pressure at the throat of the critical flow venturi nozzle of the digital valve flow control unit;

[0036] The total static temperature relationship at the throat of the critical flow venturi nozzle in the digital valve flow control unit is as follows:

[0037] ;

[0038] In the formula, The static air temperature at the throat of the critical flow venturi nozzle of the digital valve flow control unit;

[0039] Digital valve flow control unit critical flow Venturi nozzle throat treatment ideal gas state equation:

[0040] ;

[0041] Digital valve flow control unit critical flow venturi nozzle throat sound velocity definition:

[0042] ;

[0043] By combining the total static pressure relationship, total static temperature relationship, ideal gas law, and definition of sound at the critical flow Venturi nozzle throat of the digital valve flow control unit, the ideal flow rate that the digital valve flow control unit can handle at the critical flow Venturi nozzle throat is obtained. The expression:

[0044] ;

[0045] In the formula, Let the critical flow function be that of an ideal gas in a one-dimensional isentropic flow. The expression is:

[0046] ;

[0047] S43. Establish the outlet flow rate of the digital valve system. Relationship;

[0048] According to the continuity equation, the ideal outlet flow rate of a digital valve system is... The relation is:

[0049] ;

[0050] Because real air is not an ideal gas, the outlet flow rate of the digital valve system... The relation is:

[0051] .

[0052] The data analysis method for digital valve flow control units of the present invention is based on the fundamental equations of fluid mechanics. Through rigorous theoretical derivation and flow measurement experiments, a data processing and analysis method for digital valve flow control units has been established, providing experimental and theoretical support for the precise control of high-pressure air flow and having engineering application value. Attached Figure Description

[0053] Figure 1 This is a flowchart of the data analysis method for the digital valve flow control unit of the present invention. Detailed Implementation

[0054] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] Example: Figure 1 As shown, the data analysis method for the digital valve flow control unit in this embodiment includes the following steps:

[0056] S10. Install a digital valve system;

[0057] The digital valve system consists of a digital valve system inlet, a pressure regulating valve, a digital valve flow control unit, and a digital valve system outlet. The high-pressure air source is connected to the digital valve system inlet, and the digital valve system outlet is connected to the flow-demanding equipment.

[0058] S20. Install the sensor;

[0059] The digital valve flow control unit adopts a critical flow venturi nozzle design, and a total pressure sensor and a total temperature sensor are installed before the digital valve flow control unit.

[0060] S30. Conduct a flow measurement test;

[0061] Turn on the high-pressure air supply and measure the total pressure before the digital valve flow control unit. Total temperature ;

[0062] S40. Calculate the outlet flow rate of the digital valve system. ;

[0063] Based on the total pressure before the digital valve flow control unit Total temperature Calculate the outlet flow of the digital valve system :

[0064] ;

[0065] In the formula, The critical flow Venturi nozzle throat area for the digital valve flow control unit; The outflow coefficient, The critical flow function for one-dimensional isentropic flow is obtained by calibration of the critical flow Venturi nozzle of the digital valve flow control unit. Let be the gas constant of air. .

[0066] Furthermore, S40 includes the following steps:

[0067] S41. Analyze the flow state of the critical flow venturi nozzle throat of the digital valve flow control unit;

[0068] The flow in the critical flow Venturi nozzle of the digital valve flow control unit is a one-dimensional isentropic variable cross-section flow, and the continuity equation and momentum equation are as follows:

[0069] Continuity equation: ;

[0070] Momentum equation: ;

[0071] In the formula, For differential operators, Let be the air density at any cross-section. Let V be the airflow velocity at any cross-section. The flow area at any cross-section;

[0072] According to Mach number and speed of sound Definition:

[0073] ;

[0074] In the formula, Let be the static air pressure at any cross-section. The specific heat ratio of air. The static air temperature at any cross-section;

[0075] Simultaneously solve the continuity equation, momentum equation, and Mach number equation for one-dimensional isentropic flow. and speed of sound By defining the relationship between the flow area and the air velocity at any cross section of a one-dimensional isentropic flow, we obtain the following equation:

[0076] ;

[0077] According to the relationship between the flow area and air velocity at any cross section of a one-dimensional isentropic variable cross-section flow, when the air flows at subsonic speeds... hour, This is consistent with the flow state before the throat in the critical flow Venturi nozzle of the digital valve flow control unit; when the air flows at supersonic speed... hour, The flow state after the throat in the critical flow Venturi nozzle of the digital valve flow control unit is consistent with that in the digital valve flow control unit. Based on the continuity of one-dimensional isentropic variable cross-section flow, the Mach number at the throat of the critical flow Venturi nozzle of the digital valve flow control unit is... ;

[0078] S42. Establish a digital valve flow control unit to handle the critical flow rate of the Venturi nozzle throat. Relationship;

[0079] Digital valve flow control unit critical flow Venturi nozzle throat treatment ideal flow The expression:

[0080] ;

[0081] In the formula, The critical flow air density at the throat of the Venturi nozzle in the digital valve flow control unit. The critical flow velocity of the airflow at the throat of the Venturi nozzle of the digital valve flow control unit;

[0082] The total static pressure relationship at the throat of the critical flow venturi nozzle in the digital valve flow control unit is as follows:

[0083] ;

[0084] In the formula, The static air pressure at the throat of the critical flow venturi nozzle of the digital valve flow control unit;

[0085] The total static temperature relationship at the throat of the critical flow venturi nozzle in the digital valve flow control unit is as follows:

[0086] ;

[0087] In the formula, The static air temperature at the throat of the critical flow venturi nozzle of the digital valve flow control unit;

[0088] Digital valve flow control unit critical flow Venturi nozzle throat treatment ideal gas state equation:

[0089] ;

[0090] Digital valve flow control unit critical flow venturi nozzle throat sound velocity definition:

[0091] ;

[0092] By combining the total static pressure relationship, total static temperature relationship, ideal gas law, and definition of sound at the critical flow Venturi nozzle throat of the digital valve flow control unit, the ideal flow rate that the digital valve flow control unit can handle at the critical flow Venturi nozzle throat is obtained. The expression:

[0093] ;

[0094] In the formula, Let the critical flow function be that of an ideal gas in a one-dimensional isentropic flow. The expression is:

[0095] ;

[0096] S43. Establish the outlet flow rate of the digital valve system. Relationship;

[0097] According to the continuity equation, the ideal outlet flow rate of a digital valve system is... The relation is:

[0098] ;

[0099] Because real air is not an ideal gas, the outlet flow rate of the digital valve system... The relation is:

[0100] .

[0101] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. For those skilled in the art, all features disclosed in the present invention, or all steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A data analysis method for a digital valve flow control unit, characterized in that, Includes the following steps: S10. Install a digital valve system; The digital valve system consists of a digital valve system inlet, a pressure regulating valve, a digital valve flow control unit, and a digital valve system outlet. The high-pressure air source is connected to the digital valve system inlet, and the digital valve system outlet is connected to the flow-demanding equipment. S20. Install the sensor; The digital valve flow control unit adopts a critical flow venturi nozzle design, and a total pressure sensor and a total temperature sensor are installed before the digital valve flow control unit. S30. Conduct a flow measurement test; Turn on the high-pressure air supply and measure the total pressure before the digital valve flow control unit. Total temperature ; S40. Calculate the outlet flow rate of the digital valve system. ; Specifically, the following steps are included: S41. Analyze the flow state of the critical flow venturi nozzle throat of the digital valve flow control unit; S42. Establish a digital valve flow control unit to handle the critical flow rate of the Venturi nozzle throat. Relationship; Digital valve flow control unit critical flow Venturi nozzle throat treatment ideal flow The expression: ； In the formula, The critical flow air density at the throat of the Venturi nozzle in the digital valve flow control unit. The critical flow velocity of the airflow at the throat of the Venturi nozzle of the digital valve flow control unit; The total static pressure relationship at the throat of the critical flow venturi nozzle in the digital valve flow control unit is as follows: ； In the formula, The static air pressure at the throat of the critical flow venturi nozzle of the digital valve flow control unit; The critical flow rate at the throat of the Venturi nozzle of the digital valve flow control unit; The total static temperature relationship at the throat of the critical flow venturi nozzle in the digital valve flow control unit is as follows: ； In the formula, The static air temperature at the throat of the critical flow venturi nozzle of the digital valve flow control unit; Digital valve flow control unit critical flow Venturi nozzle throat treatment ideal gas state equation: ； Digital valve flow control unit critical flow venturi nozzle throat sound velocity definition: ； By combining the total static pressure relationship, total static temperature relationship, ideal gas law, and definition of sound at the critical flow Venturi nozzle throat of the digital valve flow control unit, the ideal flow rate that the digital valve flow control unit can handle at the critical flow Venturi nozzle throat is obtained. The expression: ； In the formula, Let the critical flow function be that of an ideal gas in a one-dimensional isentropic flow. The expression is: ； S43. Establish the outlet flow rate of the digital valve system. Relationship; According to the continuity equation, the ideal outlet flow rate of a digital valve system is... The relation is: ； Because real air is not an ideal gas, the outlet flow rate of the digital valve system... The relation is: ； In the formula, The critical flow Venturi nozzle throat area for the digital valve flow control unit; The outflow coefficient, The critical flow function for one-dimensional isentropic flow is obtained by calibration of the critical flow Venturi nozzle of the digital valve flow control unit. Let be the gas constant of air. .

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