CN101737805B

CN101737805B - Low-cost inside diameter-variable combustion chamber and design and test method thereof

Info

Publication number: CN101737805B
Application number: CN 200810225991
Authority: CN
Inventors: 蔡国飙; 汪小卫; 金平; 杜正刚
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2008-11-10
Filing date: 2008-11-10
Publication date: 2013-03-27
Anticipated expiration: 2028-11-10
Also published as: CN101737805A

Abstract

The invention relates to a low-cost inside diameter-variable combustion chamber and a design and test method thereof, which belongs to the field of a combustion chamber structural design method. The combustion chamber comprises a head part, a body part and a spray pipe part. The combustion chamber adopts a heat containing type structure and is made of a pure copper material with high thermal conductivity, and the body part is divided into an inner part and an outer part, i. e. an inner lining and an outer sleeve. The method comprises the following steps of: firstly obtaining the size and the number of the outer sleeve by adopting thermal analysis computation according to the requirement of inside diameter variation; and matching one outer sleeve with a plurality of inner linings to achieve an inside diameter-variable test. The inner lining and the outer sleeve are matched in the aspect of processing, and a gap is between the inner lining and the outer sleeve ensured through a tolerance, thereby saving the material of the combustion chamber, lowering the test cost and shortening the test cycle of the combustion chamber.

Description

Low-cost inside diameter-variable combustion chamber and design thereof and test method

[technical field]

The present invention relates to a kind of be used to obtaining cheaply inside diameter-variable combustion chamber and design and test method.The present invention be more particularly directed to be applied to combustion chamber and design and the test method of liquid-propellant rocket engine inside diameter-variable.

[background technology]

In the development process of thrust chamber, particularly in the development process as the ejector filler of thrust chamber primary clustering, in a large amount of preliminary research stages, in order to carry out fully experimental study, often need the combustion chamber internal diameter is changed to obtain data under the different operating modes.

Carry out in the experimental study on ground, generally adopt two kinds of chamber structure forms, namely hold hot type and Water cooling type.And hold the hot type structure regenerate the type of cooling have simple in structure, cost is low, be convenient to the advantage such as maintenance, although it has short shortcoming of single test duration, but in the initial trial stage of thrust chamber, therefore the general test period grown of not needing is held the hot type structure and is widely adopted in the research of thrust chamber combustion test starting stage.And in order to save cost and to be convenient to measure needs, hold generally whole employing high thermal conductivity materials (as: fine copper) all of hot type combustion chamber.

The general experimental study of under the internal diameter of different combustion chambers, carrying out, all adopt following two kinds of methods: 1, Calhoon, D., Ito, J.and Kors, D., " Investigation of Gaseous Propellant Combustion and AssociatedInjector-Chamber design Guide-lines; " [R] Aerojet Liquid Rocket Company, NASACR-121234, Contract NAS3-13379, July 1973. adopts the integral combustion cell structure of different inner diameters, when namely needing to change the internal diameter test, then integral replacing is carried out in the combustion chamber, this mode is simple, but owing to be whole replacing, when the different inner diameters operating mode of needs test is more, must design same number integral combustion chamber.In order to have good thermal protection, part to be designed to all that volume is large, weight is large under the rocket engine high temperature and high pressure environment, but when adopting quantity more, cost is linear the rising thereupon, and weight is difficult for greatly displacement.2, only adopt one to hold the hot type combustion chamber, will test scheduling according to the test needs and be: carry out first the test of small size internal diameter, enlarge internal diameter to carry out the experimental study of large scale internal diameter again, this method is owing to only having adopted a combustion chamber, and cost is minimum; But can not carry out neatly the exchange test between the different inner diameters, as in carrying out experimental study, often need to also need to carry out undersized test after the test of having carried out the large scale internal diameter, the method just can not be suitable for, and it has strictly limited the flow process of using; And the method internal diameter of need to constantly making amendment certainly will increase time cost.

[summary of the invention]

The purpose of this invention is to provide a kind of cost is low, can be convenient for changing combustion chamber internal diameter experimental study appearance hot type combustion chamber and design and test method, particularly need in the more situation of internal diameter size number the most applicable.

A kind of low-cost inside diameter-variable combustion chamber and design thereof and test method belong to engine chamber test field.The combustion chamber comprises: head, body section and jet pipe part.The combustion chamber is adopted and is held the hot type structure, and material adopts the pure copper material of high thermal conductivity, and body partly becomes inside and outside two parts, i.e. neck bush and outer sleeve.Respectively head of combustion chamber, jet pipe and body section structure are designed, during design body section, at first adopt CALCULATION OF THERMAL, according to the needs of internal diameter varies, obtain size and the number of outer sleeve.During test, an outer sleeve cooperates with a plurality of neck bush to reach the method that becomes the internal diameter test, and the neck bush number equals required internal diameter size number.Neck bush and outer sleeve processing aspect manufacture to be finished, and guarantees the gap by tolerance.Combustion chamber body section sealing station is the two ends of neck bush.

Advantage and good effect that inside diameter-variable combustion chamber of the present invention and design thereof and test method have are: (1) is owing to only adopted the outer sleeve of counting much less than required internal diameter size, and urceolus is enclosed within, and shared volume is large in the integral combustion cell structure, the cost ratio is high, therefore designed infrastructure cost is low, particularly in the Combustion chamber design of large-size, can save in a large number cost; (2) owing to adopted the liner structure that can be easy to change, therefore can change optionally, neatly combustion chamber internal diameter research experiment, it is convenient to use, and can be adapted to neatly the test progress.The method is applied widely, can be generalized to the application of the parts such as jet pipe.

[description of drawings]

Fig. 1 is inside diameter-variable combustion chamber assembling schematic diagram

[specific embodiment]

Further specify the present invention below in conjunction with accompanying drawing with embodiment, the single injector combustion chamber that embodiment adopts the thrust chamber development initial stage extensively to adopt describes, and method is suitable for multiinjector combustion chamber operating mode equally.

Implementing this measuring method equipment therefor mainly comprises: head 1, body section outer sleeve 2, body section neck bush 3, afterbody jet pipe part 4.

Whole design process arranges as follows:

1, the number of determining outer sleeve 2 according to inside diameter ranges and the number of required variation.On the one hand, must guarantee that outer sleeve 2 shared integral combustion chamber body section quality of materials reach certain amount, otherwise cost savings are not obvious; On the other hand, must guarantee that liner 3 thickness can not be too thin, otherwise liner 3 rigidity are too low, and combustion chamber sealing is difficult to guarantee.

2, adopt CALCULATION OF THERMAL, inspection is checked at each sealing position, liner 3 two of planting thickness, in the calculating, suppose that inner-outer sleeve forms one, carries out unstable state and calculates required test period.Surpass the encapsulant allowable temperature if find the sealing area temperature, then must increase thickness of inner lining to reach thermo-lag reliability.

3, determine the outer sleeve internal diameter size, at first outer sleeve is processed in design, and the liner external diameter that is mated assembling must manufacture with it, and clearance distance can satisfy the test needs between 0.02-0.08mm.And because outer sleeve and neck bush gap are very little, liner is heated and fits with outer sleeve in process of the test, and heat imports in the outer sleeve, can guarantee thermo-lag reliability.

The combustion chamber installation process is: at first outer sleeve is cooperated installation with neck bush, cooperate installation to finish with head and jet pipe again.

Claims

1. the method for designing of a low-cost inside diameter-variable combustion chamber, design procedure comprises: (a) design head nozzle and ejector filler structure; (b) design jet pipe dimensional structure; (c) design body section structure; It is characterized in that: the combustion chamber is adopted and is held the hot type structure, and material adopts the pure copper material of high thermal conductivity, and body partly becomes neck bush and inside and outside two parts of outer sleeve; Neck bush and outer sleeve are provided with shoulder A and shoulder B at separately close jet pipe end respectively, are used for strengthening the axial location of neck bush; Described neck bush two ends are respectively equipped with for the shoulder C that places seal member, form sealing at combustion chamber body section two ends thus; An outer sleeve cooperates with a plurality of neck bush, and neck bush external diameter and outer sleeve internal diameter clearance distance are 0.02-0.08mm; When design body section, at first adopt CALCULATION OF THERMAL, inspection is checked at the sealing position, neck bush two of each thickness, surpass the encapsulant allowable temperature if find sealing megadyne temperature degree, then increase neck bush thickness; According to the needs of neck bush internal diameter varies, obtain size and the number of outer sleeve.

2. utilize the combustion chamber of the method for designing design of the described low-cost inside diameter-variable combustion chamber of claim 1, it is characterized in that: same outer sleeve is combined respectively with a plurality of neck bush of different inner diameters.