液压式风力致热系统中节流阀致热特性仿真

Simulation Study on Induced Thermal Properties of Throttle's Valve in a Kind of Hydraulic Wind-heating System

建立了液压式风力致热系统物理模型和能量数学模型,以节流阀代替阻尼孔作为致热元件,通过Matlab软件计算,当该系统在薄壁小孔、短孔、细长孔三种基本形式阀口的情况下,对其不同的致热能力进行比较;从理论上分析在流量不变的条件下,节流阀阀口开度、角度、刚度等参数对致热效果的影响;同时利用Fluent仿真研究,两种方法的结果相一致。结果表明:薄壁小孔形式的阀口致热性能最佳;节流阀开度、角度变化会显著影响节流阀的致热效果以及较小刚度会更有利于保证阀口两端压差的恒定,从而保证了系统供热的稳定性。

This paper established a physical model and a thermal mathematical model of a kind of hydraulic wind-heating system. Replacing the orifice with throttle valve as induced thermal element, the different induced ther-mal abilities are compared when the system is in three basic forms' valve ports of thin-walled holes, short holes and tenuous holes. The induced thermal impact of throttle valve's opening degree, angle, stiffness under constant flow conditions are theoretically analyzed in this paper. Meanwhile, the simulation results based on Fluent software are consistent with that of the theoretical analysis. The results show that the valve port in the form of thin-walled holes has the best induced thermal performance. They also show that the opening degree's or angle's changes of throttle valve will significantly affect the induced thermal effects, and smaller stiffness will be more conducive to ensure a constant pressure difference across valve port keeping the stability of system heating.