System and method for measuring blade heat exchange coefficient in high-temperature environment

Abstract

The invention provides a system and a method for measuring a heat exchange coefficient of a blade in a high-temperature environment. The measuring system comprises an air blower, an air compressor, aboiler, an air storage tank, an infrared thermal imager, an experiment section, a thermocouple and the like. Instantaneous high-temperature and high-pressure airflow is applied to a to-be-measured blade through the measuring system, and a temperature value of a surface of the blade is collected through the infrared thermal imager; a differential equation for calculating the heat transfer coefficient is obtained through theoretical derivation, and the heat transfer coefficient corresponding to each measurement point can be obtained through calculation; the measuring system can approximately meet the effect that a constant-temperature incoming flow is suddenly given to act on the wall surface of the experimental blade, the response time of the temperature step is reduced; according to theoretical calculation, the differential equation is simplified under the condition that accuracy is guaranteed, a complex heat exchange problem of the turbine blade can be resolved, the fuel gas temperature for measuring the heat exchange coefficient is increased to 1200 K from 300 K, and a problem that the heat exchange coefficient of the blade cannot be directly measured under the high-temperature environment is effectively solved.

Description

technical field [0001] The invention relates to the technical field of heat transfer coefficient measurement, in particular to a measurement system and method for measuring the heat transfer coefficient of blades in a high-temperature environment. Background technique [0002] Measuring the heat transfer coefficient of turbine blades is the basic work of studying the heat transfer characteristics of turbine blades. Accurate measurement of heat transfer coefficients plays a key role in improving the reliability of blades, prolonging their life, and the success of turbine blade design. The size of the heat transfer coefficient is related to the flow state, physical properties and geometric factors of the heat transfer surface of the fluid. Due to the many factors affecting the heat transfer coefficient, variable control is difficult, and the experimental process and data processing are quite cumbersome. The measurement of the coefficient becomes difficult. [0003] The tradit...

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Problems solved by technology

Therefore, it is necessary to establish a practical and feasible high-temperature environment heat transfer coefficient measurement system and measurement method to make up for the shortcomings of traditional measurement methods, so as to solve the problem that the turbine blades in high-temperature environment are difficult to measure directly, which is of great importance for the precise design of the cooling structure of the hot-end parts of the aero-engine. Theoretical guiding significance of

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