Study on the Hybrid Cooling of the Flame Tube in a Small Triple-Swirler Combustor

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.

Investigation on Circular Array of Turbulent Impinging Round Jets at Confined Case: A CFD Study

“…They compared their results in cases without outlets and found that the nozzle field with outlets had a 20-30% higher heat transfer rate. Zhang et al [28] compared the cooling performance of hybrid impingement cooling and effusion cooling of a multiswirler combustor and concluded that the hybrid impingement cooling method was very effective. Wu et al [29] investigated an array jet impingement cooling for a simulated chip using an additively manufactured manifold design that encloses the chip with working fluid.…”

Investigations of Flow and Heat Transfer Characteristics in a Channel Impingement Cooling Configuration with a Single Row of Water Jets

“…Jet impingement cooling, ejecting high-velocity coolant from a nozzle or an orifice plate perpendicular to the target surface, yields a highly concentrated heat removal rate at the impact zone, which effectively cools a small area dissipating high heat flux. By utilizing both air and liquid as coolant, jet impingement cooling was studied in a variety of fields demanding dissipation of highly concentrated heat; cooling of blades in a gas turbine engine [11][12][13][14][15][16][17][18][19][20], quenching process in steel industries [21], and avionics cooling [22]. Jet impingement cooling is classified into three different configurations [23]: free jet when the jet is injected into less dense ambient fluid, submerged jet when the jet is injected into the same ambient fluid, and confined jet when the jet is injected into a confined space between the orifice plate and the target surface filled with the same fluid.…”