A Plasma-Based Active Control Method of High Frequency Combustion Instability

Abstract

The invention discloses a plasma-based high-frequency combustion instability active control method. The method comprises the steps that 1, plasma actuators are laid out, wherein the plasma actuators are arranged in an injector and / or on upstream and downstream wall faces adjacent to an injection panel; 2, high frequency combustion instability conditions are preset; 3, combustion chamber pressure signals are monitored; and 4, high frequency combustion instability phenomenon suppression is carried out, wherein the plasma actuators are started when the pressure oscillation amplitude in the pressure signals detected in the step 3 reaches the preset maximum pressure oscillation amplitude and the frequency reaches 1 kHz or higher until a high frequency combustion instability phenomenon is eliminated. The plasma-based high-frequency combustion instability active control method can flexibly regulate the combustion flow field in an engine and actively respond to high-frequency combustion instability under different working conditions. Meanwhile, no traditional mechanical structure exists, and the problem about thermal protection and the like is avoided; and the response is rapid, the electrical control and plasma time scale are much smaller than the flow and combustion time scale in the engine, and the high-frequency combustion instability can be suppressed at the first time.

Description

technical field [0001] The invention relates to the field of power devices such as liquid rocket engines, aeroengines, and internal combustion engines, in particular to a plasma-based active control method for high-frequency combustion instability. Background technique [0002] At present, most space vehicles, hypersonic vehicles, and aerospace aircraft use liquid rocket engines as the main power plant. However, since the discovery of combustion instability in liquid rocket engines in the late 1930s, almost every type of liquid rocket engine will encounter various combustion instability problems during the development process, and high-frequency combustion instability is generally It refers to the unstable combustion phenomenon of high-amplitude pressure oscillation with a characteristic frequency greater than 1000 Hz. [0003] The development of my country's Long March series of launch vehicles has always been accompanied by the problem of combustion instability, and has a...

AI Technical Summary

Problems solved by technology

Although this can improve the combustion stability of the liquid rocket engine to a certain extent and suppress the partial combustion instability in the test run, these methods are passive in nature, relying on engineering experience or semi-empirical theory, which greatly increases the experimental results. Time and economic costs, in the face of complex and wide working conditions, the active adaptability is very limited; and the high sensitivity of unstable combustion makes it difficult for traditional solutions to apply timely , adequate and effective control

Images