scholarly journals Consideration of the Effects of Atmospheric Pressure Change in Determination of Flow-rate Characteristics of Components using Compressible Fluids by Isothermal Discharge Method

2019 ◽  
Vol 50 (1) ◽  
pp. 25-30
Author(s):  
Kohei IIDA ◽  
Toshiya KOBAYASHI ◽  
Kotaro TADANO ◽  
Maolin CAI ◽  
Toshinori FUJITA ◽  
...  
Keyword(s):  
Flow Rate ◽  
Atmospheric Pressure ◽  
Pressure Change ◽  
Compressible Fluids ◽  
Discharge Method

scholarly journals Determination of Flow Characteristics in Technological Processes with Controlled Pressure

2020 ◽  
Vol 11 (3) ◽  
pp. 204-211
Author(s):  
T. Reader ◽  
V. A. Tenenev ◽  
A. A. Chernova
Keyword(s):  
Mathematical Model ◽  
Differential Equations ◽  
Flow Rate ◽  
Gas Flow ◽  
Safety Valve ◽  
Flow Characteristics ◽  
Pressure Change ◽  
Time Curve ◽  
Mass Rate

Assessment of the environmental and economic performance of a safety valve requires information about the flow of the substance through the valve when it is actuated. The goal of this paper was to determine the flow rate of the discharged substance and the mass flow rate of the substance entering the safety valve when it is actuated.Proposed a mathematical model to describe the processes occurring in the valve. The model includes a system of differential equations describing the physical laws of conservation in the internal volume of the valve and differential equations, which link the value of gas flow through the valve with the pressure and the amount of movement of the shut-off disk. Used a modified method by S.K. Godunov to solve gasdynamic equations.Established that the determination of the flow and power characteristics of the valve requires the preliminary construction of a mathematical model of the safety valve operation. Based on this, proposed a method for determining the flow rate of the discharged substance and the mass rate of the substance entering the safety valve when it is actuated.Obtained the flow characteristics of the valves under review and the dynamics of movement of the shutoff disc of the valve, as well as the dependence of the pressure change on the opening time of the valve. Comparison of the calculated values with available experimental data gives good agreement of results (no more than 5.6 % for a gas flow rate, under 10 % for the movement of the valve and change the arrival of gas in time using the standard deviation function of the flow characteristics of 0.6 %), confirms the correctness of the defined mathematical model, used numerical schemes and algorithms, as well as the proposed method and recoverability of the arrival of gas in a pressure–time curve.

Determination of Flow Rate Characteristics for Pneumatic Components During Isothermal Discharge by Integral Algorithm

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Tao Wang ◽  
Ling Zhao ◽  
Tong Zhao ◽  
Wei Fan ◽  
Toshiharu Kagawa
Keyword(s):  
Flow Rate ◽  
Pressure Sensors ◽  
Pressure Response ◽  
Experimental Result ◽  
Rate Characteristic ◽  
Flow Rate Characteristic ◽  
Discharge Method ◽  
Measured Pressure ◽  
Error Method

In this paper, we proposed a method to determine the flow rate characteristic parameters directly by using an integral algorithm which is not needed to calculate the flow rate. In the isothermal discharge method discussed by ISO, the flow rate characteristics of pneumatic components can be obtained by pressure response and flow rate. The pressure response is measured in an isothermal tank and the flow rate can be given by differentiating the measured pressure response. Because of using the differential algorithm, calculation precision for measurement error and distribution is much poorer. By integrating pressure experimental result with least error method, characteristics can be obtained easily with Excel tool. Some experimental results are given to show that the proposed calculation method in this paper is more effective than the conversational method by using pressure sensors with different precision.

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