複合氣動系統能量匯流動態模擬之研究

Study of Energy Merger Dynamic Simulation of Hybrid Pneumatic Power System

潘柏元(Bo-Yuan Pan)

指導教授 ： 黃國修

國立臺北科技大學/機電學院/車輛工程系所/碩士(2013年)

https://doi.org/10.6841/NTUT.2013.00418

摘要

複合氣動系統特色能使內燃機維持在最佳運轉區域下運轉，並透過能量匯流管裝置將內燃機所排放之廢氣能量與壓縮空氣混合回收利用，驅動氣動馬達產生動力，有效提升內燃機熱效率與減少廢氣排放。
藉由能量匯流管，將兩個不同的能量完整的混合與合併，而內燃機的廢能再利用是一大關鍵，壓縮空氣的壓力太大則會讓內燃機的廢能無法順利匯流及傳遞，將會大大影響最後出口端的功率，因此利用文氏管效應的原理來控制調整匯流管徑大小，使內燃機的廢能順利傳遞及匯流，進而增加氣體密度，並有效提升複合動力系統整體之效率。
本研究主要利用FLUENT軟體以數值模擬方法進行，針對二維流場中的匯流管結構，與內燃機廢氣排放時固定的週期壓力之廢能回收，設定內燃機廢氣排放時固定的週期壓力以及設定一可變動之邊界，以因應系統中的情況對匯流裝置的控制及管徑調整情況進行動態研究，並使用三種管徑調整速度對管內動態匯流之流場狀況及熱傳現象進行探討分析。

關鍵字

複合氣動系統 ； 能量匯流 ； 動態模擬

並列摘要

One characteristic of hybrid pneumatic power system (HPPS) is that it enables internal combustion engines (ICE) to operate at its sweet spot of maximum efficiency. Through energy merger device, HPPS can recycle both the exhaust-gas energy of an internal combustion engine and compress air to activate the air motor. HPPS can increase thermal efficiency of ICE and helps reduce exhaust emissions.
Through the energy merge device, these two different energies can be complete mixed and combined, and the key point is HPPS system can recycle the exhaust energy in the internal combustion engine and transform it to a useful mechanical energy. If the pressure of compressed air is too strong, it will prevent the exhaust energy from transmitting and mixing smoothly. Furthermore, it will effect the total power of air motor greatly. Therefore, in order to enable these two different energies can be complete mixed and combined, so that the tube of merge device must be controlled and adjusted according to Venturi effect, and to enhance air density and entire HPPS system efficiency apparently.
This study mainly utilizes the FLUENT software to solve questions with the numerical simulation method. In regard to the structure of merge device with two-dimension. We set up an internal combustion engine exhaust periodicity pressure and an air motor performance curve to correspond the situation of HPPS system works with the structure of merge device is controlled and adjusted. And use to adjust the diameter of three speeds. The transient phenomenon of converge state and heat transfer will also be analyzed. In addition, the change in the structure of merge device of the downstream will be observed.

並列關鍵字

Hybrid Pneumatic Power System ； Energy Merge ； Dynamic Simulation

參考文獻

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