Large thrust ratio, long-working micro-ablation throat insert and throat structure of expansion section

Abstract

The invention discloses a large thrust ratio, long-working micro-ablation throat insert and a throat structure of an expansion section. The throat structure comprises a throat insert, a backing, a bottom lining and a thermal insulation blanket of the expansion section; the external surface of the throat insert matches with a first step surface of the backing; the bottom of the backing is plastered on a second step surface of a bottom lining; the thermal insulation blanket of the expansion section matches with a third step surface of the bottom lining; the second step surface and the third step surface are on the same level; at the same time, the backing and the thermal insulation blanket of the expansion section are plastered in a circumference direction. <{EN3}>Compared with prior art, the advantages and beneficial effects are that large thrust ratio and long-working are satisfied; the throat assembly has the characteristics of micro-ablation; a good heat insulation effect in long working time is realized; intensity of a jet pipe housing is guaranteed; throat ablation amount is prevented from being overlarge and causing an obvious decrease of a secondary work pressure intensity; shock wave backflow can be prevented; and engine energy loss is avoided.

Description

technical field [0001] The invention relates to the engine tail nozzle technology, in particular to a throat structure of a micro-ablation throat liner and a diffusion section with a large thrust ratio and long-time working. Background technique [0002] The tail nozzle is one of the important parts in the engine structure. As the energy conversion device of the engine, it converts the thermal energy of the high-temperature gas into the kinetic energy of the gas, thereby generating thrust. At the same time, it is also a gas flow control device, which can establish a certain working pressure in the combustion chamber. [0003] At present, under the condition of long-time working of the commonly used exhaust nozzle, the throat lining will be obviously ablated, and the change of the throat diameter will have a significant impact on the internal ballistics of the engine, that is, the secondary working pressure will drop significantly, and at the same time, it is easy to form a...

AI Technical Summary

Problems solved by technology

[0003] At present, under the condition of long-time working of the commonly used exhaust nozzle, the throat lining will be obviously ablated, and the change of the throat diameter will have a significant impact on the internal ballistics of the engine, that is, the secondary working pressure will drop significantly, and at the same time, it is easy to form a shock wave The backflow causes the loss of thrust total impulse, so the conventional tail nozzle cannot meet the design requirements of high thrust ratio and long-term microablation

[0004] Therefore, in order to meet the requirement of low ablation rate for a long time and avoid large throat diameter ablation, resulting in shock wave backflow, it is necessary to design a new throat component structure of throat lining, backing and diffusion section

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