Analysis for Cooling Performance of a Eight Wheels Vehicle Dynamics System ( II )

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Project title

Code/計畫編號

MOST104-2623-E019-001-D

Translated Name/計畫中文名

八輪甲車動力系統冷卻性能提升分析(II)

Project Coordinator/計畫主持人

Jung-Chang Wang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

李亞偉

Department/Unit

Department of Marine Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=11266183

Year

2015

Start date/計畫起

01-01-2015

Expected Completion/計畫迄

31-12-2015

Bugetid/研究經費

714千元

ResearchField/研究領域

機械工程

本計畫為提升八輪甲車動力系統冷卻性能，以CFD（Computational Fluid Dynamics）軟體模擬八輪甲車動力艙於怠速運轉及動態操作下的熱分佈情形，為八輪甲車建立一套整合實驗與模擬的分析技術。並以熱阻網路法建立八輪甲車動力系統熱阻網路圖，求得動力系統總熱阻值，對模擬結果進行討論。如此，不僅提供解決此一複雜熱管理問題之有效方案，亦可作為因應後續動力系統升級或發展衍生車系的參考。為建立研究之模擬模型，首先對八輪甲車進行熱性能實驗，測試動力艙冷卻系統表現，實驗狀態分為怠速運轉與動態操作。研究透過ICEPAK建立動力系統散熱模組，將模擬分析之結果與實驗數據進行比對驗證，建立與熱性能實驗結果相符合之三維等效模型；研究中，怠速運轉等效模型誤差低於3.2%，動態操作等效模型誤差低於11.8%。研究並針對3D-CAD模型進行設變，建構15種不同的動力系統冷卻模型進行模擬分析，以總熱阻及平均熱對流系數比較不同動力系統冷卻模型之散熱效益。研究過程為求得模型總熱阻，透過模型中已知材料及溫度逆向求解動力系統引擎平均溫度，再討論動力系統總熱阻值。平均熱對流系數則透過模擬分析結果以牛頓冷卻定律求得。結果顯示在怠速運轉的條件下，應選擇Case2-2作為動力系統冷卻效果改善之新設計，其分析結果符合本研究增加車輛艙間利用位置及提升冷卻效能之目的，Case2-2總熱阻較實驗等效模組Case1-0降低1.079%，平均熱對流係數較實驗等效模組Case1-0提升34.81%。而在動態操作的條件下， CaseM2-2總熱阻較實驗等效模組CaseM1-0降低17.331%，平均熱對流係數較實驗等效模組CaseM1-0提升32.961%。 This project investigated cooling performance of eight-wheeled armored vehicle’s powertrain by the CFD（Computational Fluid Dynamics）software. Established an analysis techniques of experimental and simulation to eight-wheeled armored vehicles powertrain. Study establish the thermal network diagram with resistance network method, and calculate total thermal resistance of power system to discuss the simulation results. Thus, not only solve this complex heat management problems, but also as a reference provide to power system upgrades or follow derivative. To build a simulation model, we first execute thermal performance test, test powertrain cooling system performance, experimental state is divided into idling and dynamic operation. Powertrain cooling modules established by the ICEPAK, compare simulation and experimental results, establishment of the equivalent model. In study, idling equivalent model error is less than 3.2%, the dynamic operating equivalent model error is less than 11.8%. Study constructs 15 different 3D-CAD cooling model for simulation analysis. Use thermal resistance and average coefficient of thermal convection to comparison different models’ cooling efficiency. Course of the study, obtain the total thermal resistance of the model through the model known material and temperature reverse solving engine average temperature.The average coefficient of thermal convection through the simulation results obtained with Newton‘s cooling law. The results show that under idling conditions, should select Case3-2 as the new design to improve the cooling effect of the power system. It’s analysis was consistent the purpose increase of vehicles space and enhance cooling efficiency. The total thermal resistance of Case2-2 reduce 1.079% than the Case1-0, average coefficient of thermal convection of Case2-2 enhance 34.81% compared with Case1-0.And under the conditions of dynamic operation, the total thermal resistance of CaseM2-2 reduce 17.331% than the CaseM1-0, average coefficient of thermal convection of CaseM2-2 enhance 32.961% compared with CaseM1-0.

Keyword(s)

八輪甲車
動力系統
CFD
eight armored vehicles
power systems
CFD

DSpace CRIS

Analysis for Cooling Performance of a Eight Wheels Vehicle Dynamics System ( II )

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