Abstract
An experimental and numerical investigation is conducted to study the influence of different cooling schemes on the wall temperature of the flame tube in a small triple-swirler combustor in this paper. Two different cooling structures are adopted: the impingement-film and inclined multi-hole cooling structure (Scheme B, C), and the inclined multi-hole control group (Scheme A). The impact of parameters including inlet temperature (373–423 K), inlet Mach number (Ma) (0.12–0.18), and fuel–air ratio (FAR) (0.02–0.03) are discussed. The results show that the wall temperature of the flame tube rises with the increase in inlet temperature; as the inlet Mach number increases, the wall temperature (Scheme B, C) of the primary zone goes up and is distributed more uniformly; as FAR rises, the wall temperature in Scheme C is nearly unchanged, while it is increased in Scheme A and B. For the range of parameters considered in this study, the lowest wall temperature and the best cooling effect are observed in Scheme C. The experiment conducted on the impingement-film and inclined multi-hole structure shows a better cooling effect than that conducted on the traditional inclined multi-hole structure. Compared with the row number of multi-inclined holes, the diameter of jet hole has a more significant influence on the cooling effect.
Highlights
In order to improve the engine thermodynamic performance and reduce pollutant emissions, multi-swirlers have recently engaged in modern advanced combustors [1,2,3,4]
Measuring point one one is downstream of the third row of multi-inclined holes and directly facing the combustion core is downstream of the third row of multi-inclined holes and directly facing the combustion core area, area, resulting in a high wall temperature of the flame tube
With the growth of film formed by the resulting in a high wall temperature of the flame tube
Summary
In order to improve the engine thermodynamic performance and reduce pollutant emissions, multi-swirlers have recently engaged in modern advanced combustors [1,2,3,4]. A multi-swirler consists of several swirlers aligned in the same and opposite directions. The triple-swirler, one kind of multi-swirler, is very complicated as it features three swirling flow passages. Reduction in emissions and improvement in combustion performance can be achieved by distributing fuel properly in the triple-swirler in the combustion process. A typical flow field structure of a triple-swirler combustor is shown in Figure 1 [5]. The TAPS (Twin Annular Premixing Swirler) and the combustor employed in the paper are both triple-swirler combustors, and there are certain similarities in the flow characteristics
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