High temperature pressure measurement method and sensor for impulse knocking engine based on ion current

Abstract

The invention relates to a high temperature pressure measuring method and a sensor for a pulse detonation engine based on ion current. The method includes as follows: when a detonation engine burns, a plurality of free electrons and ions exist in an induction area in the detonation waves; an ion probe is adopted and a stable bias voltage is applied at the poles of the probe to form a continuous ion current in a measuring current; the attenuation speed of the current has linear relation with the pressure in a detonation tube; the pressure in the detonation tube is obtained according to the attenuation speed of the ion current. The sensor has characteristics in the structure that the anode of the sensor is inserted into a high temperature ceramics insulating tube and then is inserted into a screw cap together with the high temperature ceramics insulating tube. The screw cap is arranged in the tube wall of the detonation engine; a silicon gel seal layer is arranged above the screw cap; a stable power is directly applied between the anode and the screw cap. The device has the advantage of high temperature resistance, impact resistance, simple structure, convenient mounting and maintaining and low cost; besides, the device is applicable for the pressure measuring of the pulse detonation engine under the high temperature environment.

Description

technical field [0001] The invention designs a pressure measurement method and a sensor used in a high-temperature environment of a pulse detonation engine, and belongs to the technical field of pressure measurement. Background technique [0002] A pulsed detonation engine (Pulsed Detonation Engine—referred to as PDE) is a new type of unsteady thrust transposed detonation wave that uses the impulse generated by periodic intermittent or pulsed detonation waves to generate thrust. , The compression effect of the shock wave on the gas makes the pulse detonation engine do not need the rotating parts such as the compressor in the traditional engine, thus greatly simplifying the engine structure, reducing the weight, and improving the thrust-to-weight ratio (>20). The combustion process of the pulse detonation engine is approximately a constant volume process, with high thermal cycle efficiency and low fuel consumption. The pulse detonation engine has a wide working range, and...

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Problems solved by technology

This method can meet the requirements of detonation wave measurement, but the two poles of the probe are thin and short, and the distance between the poles is relatively close. In the case of continuous detonation, the two poles are easily impacted by the detonation wave and conduct, or carbon deposits are generated due to long-term work. Pass

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