A flow control nozzle

Abstract

The invention discloses a flow control jet pipe which comprises a pressure stabilizing segment, a jet pipe combination unit, an insert plate unit and a diffusion segment. The jet pipe combination unitcomprises a ternary jet pipe in the center and a binary jet pipe combined to the sidewall of the ternary jet pipe, the insert plate unit is installed in an inlet of the jet pipe combination unit andcomprises a single insert plate which can shield the inlet of the binary jet pipe and double insert plates which can shield both the inlet of the binary jet pipe and the inlet of the ternary jet pipe,the pressure stabilizing segment includes a cylinder whose shape is the same with that of the inlet of the jet pipe combination unit, and the diffusion segment includes a cylinder whose shape is thesame with that of the outlet of the jet pipe combination unit. The flow control jet pipe can be used to solve the problem that gas flow control is large is span and hard to control accurately, is compact in structure and easy to maintain, and uses block design and combined control.

Description

technical field [0001] The invention relates to a supersonic nozzle, in particular to a nozzle used for high-precision regulation of gas flow. Background technique [0002] At present, the development of nuclear power equipment requires gas-entrained liquid tests. The gas flow span of different test conditions is large. With the deepening of research, the test accuracy requirements gradually increase. Due to the existence of gas-liquid two-phase flow during the test process, liquid ups and downs, gas sound waves The reverse propagation phenomenon causes the gas pressure and flow to be unstable, which makes the accuracy of the gas entrainment test not high. In order to improve the accuracy of the gas entrainment test, it is necessary to provide a high-precision gas flow adjustment system. [0003] The first method of gas flow regulation is to use the flowmeter feedback signal to the regulating valve, the regulating valve responds and adjusts the opening and position, and then...

AI Technical Summary

Problems solved by technology

The third method is to use a combination of a regulating valve and a throttling device to adjust the gas flow. The commonly used throttling device is an orifice plate, which uses the sonic flow formed at the opening of the orifice plate to throttle the flow to prevent the influence of downstream pressure fluctuations. The gas pressure is adjusted by the regulating valve to stabilize the gas flow to a certain level. The advantage of this method is that the influence of the downstream flow of the orifice plate on the upstream is stabilized to a certain extent, and a relatively stable downstream flow field is provided. The disadvantage is that the flow fluctuation at the throat of the orifice plate is limited. flow regulation accuracy

Images