Constant-volume detonation combustion test device and method with function of monitoring detonation wave fluctuation behavior

Abstract

The invention relates to a constant-volume combustion bomb, in particular to a constant-volume detonation combustion test device and method with the function of monitoring a detonation wave fluctuation behavior. The device comprises a constant-volume detonation combustion bomb body, an air intake system, a high-energy ignition system, and a data acquisition and analysis system. The device and themethod have the following beneficial effect: when the constant-volume detonation combustion bomb system is applied to the study on the behavior characteristic of the detonation wave in the combustionroom for the research of super detonation of the engine, the high-energy ignition device and acetylene / oxygen mixed gas are used for generate a stable detonation wave.

Description

Technical field: [0001] The invention relates to constant-volume incendiary bombs, in particular to a constant-volume detonation combustion test device and method capable of monitoring detonation wave fluctuation behavior. Background technique: [0002] The requirements for energy saving and emission reduction are becoming increasingly stringent. As the main power source, the internal combustion engine has continuously improved its fuel economy and environmental protection performance. The miniaturization of direct injection supercharging is an important way for spark ignition engines to meet the requirements of emission and fuel consumption. However, as the compression ratio and power density of the engine continued to increase, violent knocking occurred. Once the super knock occurs, the pressure oscillation amplitude will reach or even exceed 30MPa, and the oscillation frequency will exceed 10kHz. This severe detonation will easily lead to the damage of combustion chambe...

AI Technical Summary

Problems solved by technology

This kind of violent knocking will easily lead to the damage of the combustion chamber components such as spark plugs and pistons, making the engine unable to continue to work.

However, the destruction of the piston material requires a force of up to hundreds of megapascals of pressure, and the pressure oscillation observed under severe detonation is only a few tens of megapascals at most. So how the piston material is destroyed by the severe detonation has not yet been determined.

[0003] The cylinder pressure sensor of the actual engine is installed at the cylinder head, and the pressure on the piston cannot be obtained, and the commonly used cylinder pressure sensor has a measurement range of up to 30MPa, and the resonance frequency is less than 200kHz, which cannot meet the pressure measurement requirements during severe detonation

At the same time, in the engine bench test, the violent detonation cannot be stably generated, and it is impossible to insert multiple pressure sensors on the high-speed moving piston to monitor the behavior and convergence characteristics of the detonation wave in the combustion chamber

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