網目再生器之流力數值分析

Simulation Study of Fluid Flow in Wire Mesh Regenerator

博樊(Kuttum Pavan Kumar)

指導教授 ： 康尚文 博士

淡江大學/工學院/機械與機電工程學系碩士班/碩士(2021年)

https://doi.org/10.6846/TKU.2021.00208

摘要

本文介紹了史特靈引擎再生器中壓降與熱傳特性之初步實驗和數值分析研究。
設計史特靈再生器測試平台用於分析評估與比較不同再生器在穩態條件下的壓降特性，同時進行三維 (3-D) 數值模擬以數值表徵在不同孔隙率和流動邊界條件下通過絲網再生器的壓降現象。
在實驗中，以#300目、#400目、#500目三種不銹鋼網目，以及#300/400/500和 #500/400/300的混合網目，製成直徑5 mm與長45 mm之再生器。穩流測試平台由氦氣罐、浮子流量計、兩個壓力傳感器、與一個特別設計的組件組成，其組件主要放置多孔性結構樣品。目的是在單向流實驗中測量再生器流力特性，如摩擦係數（Cf）、雷諾數（Re）、壓降等。
在數值研究中，使用CFD(計算流體力學)中的FVM(有限體積法)對不同配置的金屬網目進行研究。由標準的二參數 Ergun equation分析計算出之壓降和雷諾數關係式，可應用於等效多孔介質再生器之流力設計。

關鍵字

史特靈冷凍機 ； 再生器 ； 雷諾數 ； 摩擦係數 ； 單向流 ； 多孔結構

並列摘要

In this study, the pressure drops and friction factor characteristics of the Stirling engine regenerator were experimentally and numerically studied. The Stirling regenerator test bench is designed to analyze and evaluate different wire mesh regenerators' pressure drop characteristics under steady-state flow conditions. At the same time, 3-D numerical simulations are performed to numerically characterize the pressure loss inside the wire mesh regenerator under different porosity and flow boundary conditions.
In the experiment, three stainless steel Meshes of #300 Mesh, #400 Mesh, #500 Mesh and a hybrid mesh of #300/400/500 and #500/400/300 mesh of 5 mm diameter and a length of 45 mm were fabricated. The steady flow test bench comprises a helium gas tank, rotameter, two pressure transducers, and a specially designed module that houses the porous structure sample. The goal is to measure the hydrodynamic properties of the regenerator during the single flow experiment. In addition, pressure drop and friction factor correlation were calculated for the set of regenerator wire mesh.
For different configurations of wire mesh regenerators, the numerical research uses a finite volume method on CFD (computational fluid dynamics) models. The conventional two-parameter Ergun is obtained from the pressure drop and Reynolds number equations, and it may be confidently applied in an identical porous media for future regenerator flow.

並列關鍵字

Stirling Refrigerator ； Regenerator ； Friction Factor ； Reynolds Number ； Steady Flow ； Porous Structure

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