Effect of dilution holes on the performance of a triple swirler combustor

Abstract

A triple swirler combustor is considered to be a promising solution for future high temperature rise combustors.The present paper aims to study dilution holes including primary dilution holes and secondary dilution holes on the performance of a triple swirler combustor. Experimental investigations are conducted at different inlet airflow velocities (40-70 m/s) and combustor overall fuel-air ratio with fixed inlet airflow temperature (473 K) and atmospheric pressure. The experimental results show that the ignition is very difficult with specific performance of high ignition fuel-air ratio when the primary dilution holes are located 0.6H (where H is the liner dome height)downstream the dome, while the other four cases have almost the same ignition performance. The position of primary dilution holes has an effect on lean blowout stability and has a large influence on combustion efficiency.The combustion efficiency is the highest when the primary dilution holes are placed 0.9H downstream the dome among the five different locations. For the secondary dilution holes, the pattern factor of Design A is better than that of Design B.

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

“…The combustion chamber in the experiment is the unit structure of the real combustor, which is shown in Figure 13. The equivalent ratio of the primary zone of the combustor is 0.9:1, referring to the combustor designed by Guoyu Ding [1][2][3]. The experiments were conducted with a single screw air compressor, the maximum volume flow rate of which is 300 m 3 /h (about 0.07 kg/s).…”

“…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 primary zone of the combustion chamber is divided into two parts: the main recirculation zone, and the pilot recirculation zone. Generally, the flame stability and combustion performance can be guaranteed by the pilot recirculation zone under small operating conditions, while the main recirculation zone guarantees combustion performance under high-power conditions [6]. Low emission of NOx (nitrogen oxides) is a characteristic of the triple-swirler combustor, which requires more air in the combustion process [7].…”

Effect of rotational direction of triple-swirler on cold flow characteristics of a model combustor

“…[20][21][22][23] Consequently, the multi-swirlers have being studied widely in the field. The triple-swirler, a kind of multi-swirler, is much more complicated for featuring three swirling flow passages.…”

“…The multi-swirler was gradually engaged in modern advanced combustors for its outstanding performance, including low emission combustors [11][12][13][14][15][16][17][18][19] and high temperature rise combustors. [20][21][22][23] Consequently, the multi-swirlers have being studied widely in the field. The triple-swirler, a kind of multi-swirler, is much more complicated for featuring three swirling flow passages.…”