Single Droplet Investigation for the Design of Advanced Injection Systems
Başlık çevirisi mevcut değil.
- Tez No: 720450
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2020
- Dil: İngilizce
- Üniversite: Imperial College London
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 85
Özet
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Özet (Çeviri)
In this work, the combustion behaviour of the system is investigated via a computational model that has been developed to simulate the combustion of a single droplet subjected to an oxidizer, without any convective motion. The research has been carried out in order to develop understanding on the behaviour of different droplet sizes and dilution levels regarding combustion. The results are displayed in the form of diagrams to provide further assistance on injection systems designs inside combustion chambers. A two equation soot model has been implemented into the main model to also include the soot formation effects during the combustion. Apart from that, several modifications have been done to also include thermophoresis effect and correctly calculate the Jacobian terms for several chemical species that determine the soot formation. Later on, several simulations have been conducted to consider various cases. The analysis has been conducted considering different droplet sizes and dilution levels. Later, the variation of several parameters in both time and mixture fraction space have been investigated for temperature, soot mass fraction, scalar dissipation rate and various soot precursor that highlight the soot chemistry. Obtained results revealed that; (i) autoignition in the system occurs for dilution levels above 0.8 for all the droplet sizes investigated; (ii) all of the formed species are affected by the peak temperature, chemical steps and scalar dissipation rate present in the domain and therefore every precursor have different distributions in mixture fraction space at each time; (iii) for the investigated cases, the soot formation is in very low levels and therefore do not have a significant effect on the combustion of the droplet when compared with the results of a non – soot model and consequently appropriate diagrams to show the effect of soot could not be formed; (iv) with increasing droplet size, the maximum value of mass fraction of any species is increased due to the increasing evaporation time that allow the development of chemical reaction in the system. However for some of the species, there is a dilution level for a unique initial droplet size for which the formation of the precursor is minimal.
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