The Liquid Rocket Engine Design System Using a New Thermo-Gas-Dynamic Calculation Method

As is well known, the energy specifications of a liquid rocket engine (LRE) determine the structural scheme, geometric, mass, thrust, flight specifications and the efficiency of the rocket. Therefore, in the calculation of the LRE energy characteristics special attention is paid to thermo-chemical modeling of processes and the thermodynamic calculation of the engine chamber. Analysis of researches show that the incorrect account of the nature of chemical reactions along the length of the LRE chamber lead to errors in the assessment of the specific impulse and in the formation of the engine geometry. Consequently, the problem of correctly simulating of the flow parameters distribution over the chamber volume and taking them into account for nozzle profiling arises. With known length (L=xmax) and diameters of the LRE chamber main sections is possible to form the distribution of the number of moles of components, heat capacity and isentropic index (N~f(x), c~g(x) and γ~h(x)) of the gas mixture. Thus, has been developed a new methodology for the LRE design, which is based on the thermodynamic calculation equations, the method of characteristics and the sigmoidal function of the flow velocity distribution. This system provides appropriate geometry forming of the chamber and improving of the LRE energy parameters at the preliminary design stage.

Yeni Termo-Gaz Dinamik Hesaplama Yöntemi Kullanan SYRM Tasarım Sistemi

Bilindiği gibi, sıvı yakıtlı roket motorunun (SYRM) enerji özellikleri roketin tasarım şemasını, geometrik, kütle, itki, uçuş özelliklerini ve verimini belirler. Bu nedenle, SYRM'nin enerji özelliklerinin hesaplanmasında, süreçlerin termokimyasal modellenmesine ve motor odasının termodinamik hesaplanmasına özellikle dikkat edilir. Bu alandaki araştırmaların analizi gösterir ki, SYRM'nin odası boyunca kimyasal reaksiyonların doğasının doğru dikkate alınmaması özgül impulsun değerlendirmesinde ve motor geometrisinin oluşumunda hatalara neden olur. Sonuç olarak, akış parametrelerinin SYRM odasının (yanma odası ve nozul) hacmine göre dağılımının doğru şekilde simüle edilmesi ve bunların nozul profillemesi için dikkate alınması problemi ortaya çıkmaktadır. Eğer SYRM odasının uzunluğunun (L=xmax) ve ana bölümlerinin çaplarının değerleri biliniyorsa gaz karışımının bileşenlerinin mol sayısının, özgül ısının ve izentropik katsayının (N~f(x), c~g(x) ve γ~h(x)) dağılımını şekillendirmek mümkündür. Belirtilenler dikkate alınarak SYRM odasının tasarımı için termodinamik hesaplama denklemlerine, karakteristikler yöntemine ve akış hızının dağılımının sigmoidal fonksiyonuna dayanan yeni tasarım metodolojisi geliştirilmiştir. Bu sistem itki odasının uygun geometrisinin oluşturulmasını ve ön tasarım aşamasında SYRM'nin enerji parametrelerinin geliştirilmesini sağlar.

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