Temperature-measuring device for cylindrical combustion chamber wall

Abstract

The invention provides a temperature-measuring device for a cylindrical combustion chamber wall, comprising a cylindrical combustion chamber, a pressing plate (A), a pressing plate (B) and spring-type thermocouples. All the spring-type thermocouples in the temperature-measuring device can be rapidly assembled and disassembled to prolong the service life of single spring-type thermocouple. In the temperature-measuring process of the spring-type thermocouples, the temperature-measuring heads of the spring-type thermocouples can constantly keep contact with the measuring points of the cylindrical combustion chamber wall to avoid causing measurement failures because of poor contact.

Description

technical field [0001] The invention belongs to the technical field of temperature measurement of liquid rocket engine combustion chambers, and in particular relates to a temperature measurement device for the wall surface of a cylindrical combustion chamber. Background technique [0002] The gas-gas injector or gas-liquid injector is a key component of a liquid rocket engine, and the performance of the injector directly affects the overall performance of the combustion chamber. Various research institutions are developing gas-gas injector or gas-liquid During the injector test, the body of the combustion chamber is mostly designed with a cylindrical combustion chamber, and copper or oxygen-free copper is generally used as the base material of the combustion chamber. This material has a large heat capacity, high thermal conductivity, and a large linear expansion coefficient. softer. [0003] When studying the performance of injectors at home and abroad, by measuring the mul...

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Problems solved by technology

In the 2008 document "Measurement Method of Heat Transfer Characteristics of Single Nozzle Combustion Chamber" in the journal "Propulsion Technology", the temperature measurement method of the gas-gas injector heat capacity combustion chamber was studied. Each thermocouple was disassembled and installed separately. It is troublesome and time-consuming to disassemble, and the thermocouple is fastened by screws, which has caused hard damage to the thermocouple itself, and due to the violent vibration of the engine during the hot test, some thermocouples at the measuring points are loose and have poor contact, resulting in some measurement results being unusable

In particular, all measuring points must be reinstalled after each test, and the installation needs to wait until the engine is completely cooled to close to the ambient temperature, which is time-consuming and labor-intensive

If this temperature measurement method is applied to the temperature measurement of the gas-liquid injector heat capacity combustor, since the gas-liquid injectors in liquid rocket engines mostly use low-temperature propellants such as liquid oxygen, low-temperature pre-heating is required before the combustion chamber heat test. Cold, the combustion chamber shrinks at low temperature, the inner and outer walls shrink unevenly, and there will be serious poor contact at the temperature measuring point. If personnel go to reinstall the thermocouple at this time, there will be certain safety hazards

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