Experimental Investigations on Detonation Initiation Characteristics of a Liquid-Fueled Pulse Detonation Combustor at Different Inlet Air Temperatures

Wenhao Tan, Longxi Zheng, Jie Lu (), Lingyi Wang and Daoen Zhou
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Wenhao Tan: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
Longxi Zheng: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
Jie Lu: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
Lingyi Wang: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
Daoen Zhou: School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China

Energies, 2022, vol. 15, issue 23, 1-16

Abstract: The detonation initiation characteristics of a single tube liquid-fueled pulse detonation combustor (PDC) is investigated at different inlet air temperatures in this paper. The inner diameter of the PDC is 62 mm. Gasoline and air are used as fuel and oxidant, respectively. The inlet air temperature is 288–523 K and the operating frequency of the PDC is 10~30 Hz. The experimental results show that the deflagration to detonation transition (DDT) distance, detonation initiation time, DDT time and jet ignition time decrease with the increasing operating frequency at the same inlet temperature. When the inlet temperature is 288 K, the DDT distance is shortened from 860.5 mm to 787.7 mm as the operating frequency increases from 10 Hz to 30 Hz. The detonation initiation time, the jet ignition time and the DDT time are reduced from 10.01 ms, 7.66 ms and 2.35 ms to 6.55 ms, 4.99 ms and 1.56 ms, respectively. When the inlet air temperature increases, the atomization and evaporation of the gasoline is improved, which also leads to the decrease in the DDT distance, the detonation initiation time, the jet ignition time and the DDT time. For example, when the inlet air temperature increases from 288 K to 523 K at the frequency of 10 Hz, the DDT distance is shortened from 860.5 mm to 747.2 mm and the detonation initiation time, the jet ignition time and the DDT time is reduced to 5.867 ms, 2.51 ms and 1.11 ms, respectively. Additionally, the self-ignition caused by high inner wall temperature occurs when PDC is operating at high frequency under high inlet air temperature.

Keywords: two-phase detonation; pulse detonation combustor; DDT distance; detonation initiation time; self-ignition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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