The Temperature Field Characteristics of Deflector Jet Servo Valve Under Extreme High-Temperature Conditions

The Deflector Jet Servo Valve (DJSV) is often exposed to operating conditions with extreme high-temperature environments. Such as, the DJSV is installed within aero engines, the ambient temperature can reach as high as 250°C, and the maximum temperature of the working oil is 140 °C. To ensure optimal performance, the temperature distribution of DJSV under extreme high-temperature conditions is simulated by Fluent simulation software. By combining the simulation results with the actual working conditions, a new self-cooling structure of DJSV is proposed, and the cooling effect of this structure is comparatively analyzed. The results indicate that under extreme high-temperature conditions with ambient temperature conditions of 250°C and working oil temperature of 140 °C the DJSV exhibits an overall temperature ranging from 140°C to 233 °C. The highest temperature appears at the upper end of the torque motor shell. The temperature of the torque motor component exhibits a temperature gradient in the longitudinal direction, and ranges from143°C to 222°C. The torque motor exhibits a high overall temperature and significantly impacts the performance of the servo valve, which is a temperature-sensitive part. In response, a self-cooling structure is proposed, and the temperature distribution of the modified DJSV is analyzed. The analysis result indicates an overall temperature range reduced to 140 °C-182 °C, in which the temperature of the torque motor component effectively reduces to 140 °C-157 °C demonstrating the efficacy of the self-cooling structure. The analysis of the temperature field characteristic of the DJSV under extreme high-temperature conditions provides a theoretical basis for the design and manufacture of the DJSV.