CN-224214267-U - Ablation examination structure for expansion section of jet pipe of solid rocket engine

Abstract

The utility model relates to an ablation examination structure for a nozzle expansion section of a solid rocket engine. The expansion section consists of an ablation examination sample block and a low-cost open-pore expansion section, the ablation performance of the material of the braided expansion section in two states can be examined once, in order to avoid the burning through of gas at the joint part, the examination sample block adopts a step plunger type structure to form a combination of the step plunger type ablation sample block and the open-pore expansion section, the combination is arranged in a spray pipe shell to form a spray pipe, and the spray pipe is connected with a real solid rocket engine, so that the aim of examining the ablation performance of various braided expansion section materials through one-time solid rocket engine test under the same working condition can be realized. According to the utility model, a plurality of step plunger type examination sample blocks are embedded into the expansion section of the spray pipe, so that the examination of the ablation performance of the expansion section material under the actual working condition of the solid rocket engine is realized, and the examination authenticity and examination efficiency of the expansion section material are improved.

Inventors

• HAN XIAOBO
• LI YUEQIONG
• ZHANG JINGYUAN
• CHEN GUOFENG
• QUAN WEILI
• LIU YUXIN
• GAO KE

Assignees

• 内蒙动力机械研究所

Dates

Publication Date

20260508

Application Date

20241204

Claims (6)

1. 1. A solid rocket engine spray pipe expansion section ablation examination structure is characterized in that an ablation examination sample block adopts a stepped plunger type structure, the bonding surface of the ablation examination sample block and an open pore expansion section is a stepped cylindrical surface, a tortuous butt joint surface is formed, the outside is protected through a spray pipe shell to prevent fire penetration, and the ablation examination sample block is made of the same batch of fiber materials in the spray pipe expansion section to be examined and is an expansion section flat plate prepared by the same technological method.
2. 2. The solid rocket engine nozzle expansion ablation test structure according to claim 1, wherein the test sample block is assembled with the nozzle expansion section in a manner that a small diameter cylinder faces upwards.
3. 3. The solid rocket engine nozzle expansion ablation examination structure of claim 1, wherein five or eight examination sample blocks are adopted.
4. 4. The solid rocket engine nozzle expansion section ablation examination structure of claim 1, wherein more than two axial positions are selected according to the expansion section size, and the examination blocks are assembled along the circumferential opening.
5. 5. The solid rocket engine nozzle expansion ablation examination structure of claim 1, wherein said ablation examination block is cylindrical or conical.
6. 6. The ablation examination structure of the expansion section of the solid rocket engine nozzle of claim 1, wherein the diameter of the upper cylinder of the stepped plunger type examination sample block is phi 10, the diameter of the lower cylinder is phi 18, and the total thickness is 15mm.

Description

Ablation examination structure for expansion section of jet pipe of solid rocket engine Technical Field The utility model relates to the technical field of nozzle performance test, in particular to an ablation and assessment structure for a nozzle expansion section of a solid rocket engine. Background The jet pipe of solid rocket engine is mainly composed of throat lining, expansion section, jet pipe shell and ablation heat insulating layer. The expansion section is an important component of the spray pipe, is a key component for converting chemical energy into kinetic energy, and the working environment of the expansion section is high-temperature high-pressure high-speed fuel gas. Ablation of the expansion section material is affected by factors such as gas characteristics, gas flow rate, combustion chamber pressure, etc., as well as bulk characteristics of the material. At present, oxyacetylene ablation is a main method for ablation assessment of woven expansion section materials, and can not truly reflect the ablation condition of the expansion section in a solid rocket engine, so that the ablation characteristics of the expansion section under the actual working condition of the solid rocket engine can not be effectively verified. The ablation performance of the expansion section material is evaluated by the ablation test of the solid rocket engine test run, so that the method has important guiding significance and engineering application value for the expansion section thermal structure design, but the actual working condition of the expansion section can be reflected by the actual examination of the ablation characteristics of the expansion section material by adopting the actual solid rocket engine, and the preparation period is long and the examination cost is high. The existing method for assessing the ablation performance of the woven expansion section material mainly comprises the steps of preparing a flat plate by adopting the same batch of fibers and the same process, cutting an ablation sample from the flat plate, and finally judging the ablation performance by adopting an oxyacetylene ablation method, wherein the ablation environment of the oxyacetylene ablation method cannot truly simulate the influence of factors such as two-phase flow and gas components caused by Al2O3 particles of a solid rocket engine on the ablation, so that the verification of the ablation characteristics of the expansion section under the actual working condition of the solid rocket engine cannot be effectively carried out. Therefore, the ablation test engine is adopted to evaluate the ablation of the expansion section, and the engine has extremely high similarity with the actual working condition, thereby being beneficial to the evaluation of the ablation characteristics of the expansion section. However, the performance of the woven expansion section material or the expansion section preparation process needs to pass multiple solid rocket engine nozzle test and check verification, and the solid rocket engine is high in price. In addition, the woven expansion section is prepared by firstly utilizing fibers and carbon cloth, then adopting resin impregnation and pressurizing curing molding, and finally preparing the woven expansion section product, wherein the process leads to the preparation period of the expansion section from the fibers to the preform to the blank molding, the period is often more than one month or even more than half a year, and the time and the cost for testing the ablation performance of the expansion section are extremely high. Disclosure of Invention Aiming at the problem, the utility model provides an ablation examination structure of a combined expansion section of a jet pipe of a solid rocket engine, which aims at solving the problems of high cost, long preparation period, low examination efficiency, especially the problems of long preparation period, high cost, serious restriction on the examination of the ablation performance of the braided expansion section and the like of the existing method. In order to solve the technical problems, one of the purposes of the utility model is to provide an ablation examination structure for an expansion section of a jet pipe of a solid rocket engine, an ablation examination sample block adopts a stepped plunger type structure, an adhesion surface of the ablation examination sample block and an opening expansion section is a stepped cylindrical surface, a zigzag butt joint surface is formed, and the outside is protected by a jet pipe shell to prevent fire penetration, wherein the ablation examination sample block is made of the same batch of fiber materials in the expansion section of the jet pipe to be examined, and is an expansion section flat plate prepared by the same technological method. Furthermore, the check sample block is assembled with the spray pipe expansion section in a mode that a small-diameter cylinder faces upwards, so that the work of