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Area-variable rotary detonation combustion chamber exhaust nozzle

A combustion chamber and tail nozzle technology, applied in the field of rotating detonation combustion chamber tail nozzle, can solve the problems of thrust loss, difficulty in real-time and accurate adjustment of the local area of ​​the nozzle, etc., achieve fast response speed, optimize overall propulsion performance, extend The effect of service life

Inactive Publication Date: 2021-07-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the commonly used axisymmetric nozzle structure is used, the design point can only be achieved locally. The traditional mechanical adjustment method can only change the nozzle area as a whole, and it is difficult to accurately adjust the local area of ​​the nozzle in real time to adapt to the state change of the local outlet airflow. resulting in thrust loss

Method used

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  • Area-variable rotary detonation combustion chamber exhaust nozzle
  • Area-variable rotary detonation combustion chamber exhaust nozzle

Examples

Experimental program
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Effect test

Embodiment 1

[0020] see figure 1, In this example, an annular combustion chamber is used, and a plug nozzle is installed at the tail. The air supply channel of the throat width adjustment system runs through the column in the combustion chamber and extends to the position in front of the central conical throat of the plug nozzle. The air supply ring hole 8-1 and the air supply ring hole 8-2 share the air supply channel 7-1, forming series path; similarly, the gas supply ring hole 8-5 and the gas supply ring hole 8-6 share the gas supply channel 7-4; the gas supply ring hole 8-3 and 8-4 are respectively connected with two gas supply channels, and each supply The gas channels are connected in parallel, and the gas supply flow rate is changed by adjusting the solenoid valve 10 on different gas supply channels 7. The outflowing gas is attached to the center cone of the nozzle to form a "fluid wall", and the local throat at different circumferential positions of the nozzle can be adjusted in re...

Embodiment 2

[0022] see figure 2 , In this example, an empty barrel type combustion chamber is used, and a Laval nozzle is installed at the tail. In order to reduce the overall windward area of ​​the engine, only a single air supply channel 7-1 is arranged on the outer ring of the combustion chamber, and each row of ring holes is connected in series. By controlling the solenoid valve 10 to change the air flow, the formed "fluid wall" interacts with the main flow according to the local flow field pressure, compression or expansion occurs, and the throat area and area ratio required for local air expansion are adjusted in real time. The formed "fluid wall" also reduces the heat load on the inner wall of the nozzle. In addition, when the working state of the engine changes, the air supply flow rate can be adjusted, the thickness of the "fluid wall" can be changed, and the ratio of the throat area of ​​the nozzle to the required area can be adjusted macroscopically, so that the air flow in t...

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Abstract

The invention provides an area-variable rotary detonation combustion chamber exhaust nozzle. The exhaust nozzle comprises a rotary detonation combustion chamber body and an area-variable exhaust nozzle body. An exhaust nozzle area adjusting system is adjusted, a layer of fluid wall surface is formed on the wall surface of the exhaust nozzle, the fluid wall surface can be compressed or expanded along with different distribution of mainstream flow field pressure in circumferential positions according to the unsteady exhaust characteristic of the rotary detonation combustion chamber, the actual area needed by local mainstream expansion is rapidly changed, the ideal expansion process of airflow in the nozzle is achieved, and the propelling performance of an engine is improved. Meanwhile, when the working point of the engine is changed, the thickness of the fluid wall surface can be changed by adjusting the air supply flow, so that the throat area of the exhaust nozzle and the required area ratio are macroscopically and integrally changed, the working range of the engine is widened, and wide-area working of the engine is realized. The exhaust nozzle can be used in the fields of detonation propulsion and the like.

Description

technical field [0001] The invention relates to the field of detonation propulsion, in particular to a variable-area rotary detonation combustion chamber tail nozzle. Background technique [0002] Rotating Detonation Engine (RDE), as a new type of power device, has potential advantages such as simple structure and high thermal cycle efficiency, and has broad application prospects. It has received extensive attention in recent years. [0003] In existing research, rotating detonation combustors are generally divided into two structural types: annular (with inner column) and empty barrel (without inner column). Fuel and oxidant are injected from one end (the head of the combustion chamber), and the detonation wave propagates in the circumferential direction to consume the combustible gas mixture. The high-temperature and high-pressure gas expands backward to do work and is discharged from the other open end (the tail of the combustion chamber). In order to improve the propuls...

Claims

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Application Information

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IPC IPC(8): F23R3/38
CPCF23R3/38
Inventor 范玮朱亦圆赵明皓李清安张玉坤曹力文王可
Owner NORTHWESTERN POLYTECHNICAL UNIV
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