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YANG Lihong
School of Mechanical Engineering,
University of Shanghai for Science
and Technology,
Shanghai 200093, China
LIU Chengliang
School of Mechanical Engineering,
Shanghai Jiaotong University,
Shanghai 200240, China
ZHA Xuanfang
University of Maryland,
MD 20742, USA
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EFFECTS OF POLYTROPIC EXPONENT ON DATA
PROCESSING METHODS
USED IN CONSTANT VOLUME
DISCHARGE
Abstract:
In order to obtain the accurate sonic conductance of solenoid valves, the polytropic exponent is used in the data processing of the discharge method for measuring the flow rate characteristics of pneumatic components. Three data processing principles are first introduced, and then the discharge pressure data obtained from the measured solenoid valve are processed to obtain the sonic conductance with three methods: the partial polytropic exponent method, the complete polytropic exponent method and the adiabatic method. By comparison of the obtained results it indicates that the complete polytropic exponent method is the most accurate. However, the partial polytropic exponent method is of a high applicable value, because it is easy and simple to measure and the obtained results are relatively accurate.
Key words:
Polytropic exponent Discharge method Sonic conductance |