High-pressure orifice plate gas stagnation temperature control device and method

Abstract

The present invention belongs to the orifice plate gas flow measurement technical field and relates to a high-pressure orifice plate gas stagnation temperature control device and method. The control device is a temperature control gas tank; a temperature control gas tank inlet flange is externally connected with the outlet of a gas source; a front porous rectifying plate is clamped to a temperature control gas tank wall through a temperature control gas tank inlet expanding type clamp plate flange by means of bolts; electric heating rods are fixedly clamped to a rear porous rectifying plate through the front porous rectifying plate; line collection rings are located on the rear porous rectifying plate; electrode springs are clamped between electric heating rod inner electrodes and external electrodes; the external electrodes are embedded in insulating materials; the insulating materials are embedded in metal plugs; the metal plugs are welded to ball head-taper surface sealing structures; the ball head-taper surface sealing structures are welded to the temperature control gas tank wall; and outer periphery flow guiding holes and inner periphery flow guiding holes are located on the rear porous rectifying plate. With the high-pressure orifice plate gas stagnation temperature control device and method of the invention adopted, gas temperature at the inlet of an orifice plate can be effectively compensated in a certain range, the accuracy of key parameter measurement participating in the calculation of the discharge coefficient of the orifice plate can be ensured, and the accuracy of the calibration of the discharge coefficient of the orifice plate can be improved.

Description

technical field [0001] The invention belongs to the technical field of orifice gas flow metering, and in particular relates to a high-pressure orifice gas stagnation temperature control device and method. Background technique [0002] The high-pressure orifice gas large flow calibration device uses the system group composed of parallel standard sonic nozzles as the standard meter, and the positive pressure PVTt device as the main standard. The gas flow rate of the orifice plate to be calibrated is obtained by calibrating the sonic nozzle group. : The gas modulated by the gas source and gas distribution system flows through the orifice plate to be calibrated and the standard sonic nozzle group sequentially. By measuring the temperature and pressure in the stagnant container before the sonic nozzle group, the mass flow rate q of a single sonic nozzle i From formula (1) get: [0003] [0004] In the formula: A is the throat area of ​​the sonic nozzle; R and M are the univer...

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Problems solved by technology

Because this system belongs to the category of high-pressure and high-speed pipe flow, the gas flow rate is fast, and the heat exchange time must be very short. The method of constant temperature water bath or constant temperature oil bath will not achieve good results, and directly heating the high-pressure

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