Journal of Space Science and Technology

Journal of Space Science and Technology

Effect of Injector Pressure Drop on The ‎Performance of A 1 N Monopropellant ‎Thruster

Document Type : Original Research Paper

Authors
Institute of Space Transportation Systems, Iran Space Research Institute, Tehran, Iran
Abstract
The effects of injector pressure drop on the performance of a catalytic reactor are studied experimentally. The injectors were simple orifices. Dynamic interactions between the injector and the reactor determine the transient behavior of the system. Results showed that the injector pressure drop affected neither the decomposition reaction efficiency nor the ignition delay time. However, pressure response time increased, and pressure roughness decreased with increasing injector pressure drop. Interestingly, the response time curve had a slope change at a 20% pressure drop. As discussed in the paper, the slope change is a result of cavitation phenomena in high pressure drop. It is concluded that cold injector tests are not enough for injector design validation, and performance tests are necessary tasks.
Keywords
Subjects

Article Title Persian

بررسی اثر افت فشار انژکتور بر عملکرد رانشگر ‏تک‌پیشرانه هیدرازینی یک نیوتنی

Authors Persian

علیرضا رجبی
نورالدین قدیری معصوم
محمدعلی امیری‌فر
سید رشاد روح‌الامینی
پوریا میکانیکی
محمد قربی
مجید کامرانی‌فر
پژوهشکده سامانه‌های حمل و نقل فضایی، پژوهشگاه فضایی ایران، تهران، ایران
Abstract Persian

نتایج مطالعه روی رفتار یک رانشگر تک‌پیشرانه هیدرازینی هنگام استفاده از انژکتورهایی با ابعاد مختلف ارائه می‌شود. انژکتورهای استفاده شده در این رانشگرها از نوع اریفیس هستند. هرچند الگوی جریان سیال در این انژکتورها ممکن است ساده به نظر برسد، رفتار رانشگر -که ناشی از اندرکنش دینامیک انژکتور با محفظه است- ویژگی‌های جالب توجهی را نشان می‌دهد. افت فشار انژکتور، در محدوده مورد مطالعه، تاثیری بر سرعت مشخصه و تاخیر اشتعال نداشت. با این حال زمان پاسخ 90% فشار و نوسان فشار محفظه به شدت تحت اثر افت فشار انژکتور هستند؛ با افزایش افت فشار، زمان پاسخ افزایش می‌یابد اما نوسان فشار کم می‌شود. نتایج ارائه شده ثابت می‌کند که آزمون سرد انژکتور برای ارزیابی و صحه‌گذاری طراحی آن کافی نبوده و اهمیت تست گرم رانشگر را نشان می‌دهد. بحث‌های این مقاله همچنین برای طراحان هر سامانه‌ای که از اریفیس برای کنترل دبی استفاده می‌کنند و به دنبال تحلیل رفتار گذرای آن سامانه‌ها هستند، قابل توجه خواهد بود.

Keywords Persian

رانشگر تک‌پیشرانه هیدرازینی
افت فشار انژکتور
اریفیس
رفتار دینامیک
زمان پاسخ
نوسان فشار
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  • Receive Date 16 September 2020
  • Revise Date 06 February 2022
  • Accept Date 07 February 2022
  • First Publish Date 07 February 2022