A Pressure Control System for Engine Nozzle Test

Abstract

The invention provides a pressure control system for an engine nozzle test. A pressure sensor is installed on the side, adjacent to a nozzle, of the back of a regulating valve and is arranged far from the nozzle. The pressure sensor is used for measuring the pressure of fuel oil entering the nozzle and synchronously feeding back measured values to a pressure controller in real time for comparison and calculation, and therefore the regulating valve can be regulated and closed-loop control can be achieved. A low-range pressure sensor and a high-range pressure sensor are arranged close to the nozzle respectively to measure the pressure on the inlet of the nozzle in a segmented mode. The pressure sensor is installed on the side, adjacent to the nozzle, of the back of the regulating valve and is arranged far from the nozzle, the measured values can be synchronously fed back to the controller in real time, so pressure regulation is free of overregulation and overshoot, interference of fluctuation of a spring in the nozzle in pressure measurement in a feedback link is avoided, and regulation stability is greatly improved. The two high-accuracy pressure sensors, namely the low-range pressure sensor and the high-range pressure sensor, are used for measuring the pressure on the inlet of the nozzle in a segmented mode, so pressure display is accurate, and work efficiency is improved.

Description

technical field [0001] The invention belongs to the engine nozzle test technology, and relates to a pressure control system for the engine nozzle test. Background technique [0002] In the engine nozzle test, the working pressure is the key control parameter for nozzle detection, which directly affects the detection of parameters such as nozzle flow rate and atomization angle. The test specification requires: at the working pressure of 0.2, 0.557, 1.38, 1.432, 1.48, 1.53, 1.84, 2.35MPa and other pressures, the flow rate, atomization angle and mist cone eccentricity angle are measured. The pressure must be accurately controlled in place from low to high, no overshoot callback is allowed, and the accuracy is ±0.5%. Although the general pressure adjustment method can realize PID automatic adjustment, it cannot realize fast, accurate and stable automatic adjustment without overshoot of multiple pressure control points. Whether the test pressure control is accurate and whether ...

AI Technical Summary

Problems solved by technology

When it is necessary to change the working pressure from low to high, the change of the external pressure given value and the delay of the measured value fed back by the pressure sensor make the comparison between the two in the pressure controller and the calculation of the value out of sync, resulting in pressure overshoot, Overshoot, at the same time, because the spring fluctuation in the nozzle interferes with the pressure measurement of the feedback link, making the adjustment system difficult to converge and the adjustment slow

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