本研究旨在開發一套交談式水動力衝壓噴射推進噴嘴之性能分析及優化設計程式。首先以均質氣泡流模型，根據設計者輸入之相關資料，計算當噴嘴出口壓力達到環境壓力時，噴嘴之入口速度、潛體入口直徑、需加入之氣體質量流率、噴嘴之出口相對尺寸、出口馬赫數及出口比衝量等。其次可依設計者之需求，以雙流體模型進行噴嘴流場分析，並依照分析結果來修正相關之參數。所有的計算程式以視覺化軟體Visual Basic統整，改善使用者與電腦間之操作介面，使得設計者無需死記繁雜的輸入格式，而能輕易地掌握輸入及輸出之結果。

　　This study aims at developing an interactive computer program that helps to analyze and optimize the performance of the nozzle for underwater jet propulsion. The program, firstly, based on the homogeneous bubbly flow model and the correctly expanded condition at nozzle outlet, calculates the speed of the fluid at the nozzle entrance, the entrance diameter of the submerged body, mass flow rate of the supply gas, relative diameter of the nozzle exit, exit Mach number, and the specific thrust. A two-fluid model can then be employed, as the choice of the users, to simulate the bubbly flow in the nozzle. Results from the computation are adapted to modify related parameters. All of the computational programs are integrated using Microsoft Visual Basic to facilitate the interface between the users and computer, The users do not need to memorize complex input format and, instead, can handle the input and output data very easily.

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