前置级微非对称结构对伺服阀温漂特性影响研究

With the improvement of the aeroengine performance requirements, the temperature range of the main electro-hydraulic servo valve of the main control element is further increased,which will aggravate the generation of servo valve temperature drift and aggravate the influence on the zero performance of the servo valve. This project studys the variation of the state of fuel flow in slender orifices in a wide temperature range, the characteristics of impinging jets under the influence of micro-asymmetric structures and the fluid-solid coupling dynamics of struts under high-speed jet impacts,aiming at exploring the temperature drift characteristics of the fuel electro-hydraulic servo valve, according to the features of its pre-stage micro-asymmetric structure, centering around the"micro-asymmetric high-speed impingement characteristics in wide temperature range conditions"and "high-speed jet impact support bar of fluid-solid coupling dynamic characteristics" of two key scientific problems.The characteristic of the project is to focus on the working conditions in a wide temperature range to study the influence law of the micro asymmetry of the pre-stage structure of the servo valve on the temperature drift, and the innovation is to obtain a principle of pre-stage structural parameter matching for a wide range of working conditions of the fuel electro-hydraulic servo valve,micro-asymmetric impinging jet flow field analysis methods and the influence of pre-stage micro-asymmetric structure on temperature drift characteristics in wide temperature range working conditions of fuel electro-hydraulic servo valve. It is of great theoretical and practical value to improve the zero performance and reliability of the fuel electro-hydraulic servo valve.

随着对航空发动机性能要求的提升，其主要控制元件的燃油电液伺服阀可工作的温度范围进一步增加，这将加剧伺服阀温漂产生，加重对伺服阀零位性能的影响。本项目以探索燃油电液伺服阀温漂特性为目标，针对其前置级微非对称结构的特点，围绕“宽温域工况微非对称高速冲击射流特性”和“高速射流冲击下支撑杆流固耦合动力学特性”两个关键科学问题，研究宽温域细长阻尼孔燃油流动状态变化规律，微非对称结构影响下的冲击射流特性和高速射流冲击下支撑杆流固耦合动力学特性。特色是着眼于宽温域工况，研究伺服阀前置级结构的微非对称性对温漂的影响规律，创新是得到适用于宽温域工况燃油电液伺服阀前置级结构参数匹配原则、微非对称冲击射流流场解析方法和宽温域工况燃油电液伺服阀前置级微非对称结构对温漂特性影响规律。对提升燃油电液伺服阀零位性能及可靠性，具有重要理论意义和实用价值。

燃油电液伺服阀作为航空发动机的核心部件，对航空发动机性能起到至关重要的作用。随着航空发动机性能的提高，伺服阀的工作环境更加恶劣，对燃油电液伺服阀的环境适应性提出更高的要求。. 本项目以探索燃油电液伺服阀温漂特性为目标，针对其前置级微非对称结构的特点，围绕“宽温域工况微非对称高速冲击射流特性”和“高速射流冲击下支撑杆流固耦合动力学特性”两个关键科学问题，研究宽温域细长阻尼孔燃油流动状态变化规律，微非对称结构影响下的冲击射流特性和高速射流冲击下支撑杆流固耦合动力学特性。通过研究利用流场分析手段对伺服阀前置级微非对称射流冲击进行研究，得到微非对称结构尺寸参数对零位性能的影响。提出伺服阀前置级结构参数匹配原则，为伺服阀结构设计提供理论支撑。针对强壁面约束高速冲击射流特性和支撑杆的流固耦合力学特性开展研究，提出微非对称结构条件下伺服阀前置级流场解析办法。本项目着眼于伺服阀前置级宽温域微非对称结构，通过有限元分析和实验 相结合的手段，对前置级微非对称冲击射流流场进行深入研究，揭示伺服阀温漂特性的影响规律。对提升燃油电液伺服阀零位性能及可靠性，具有重要理论意义和实用价值。