Analysis of Equivalence Ratio in an Oxygen Acetylene Mixture

The paper presents an exclusive approach to analyze the oxygen and acetylene mixture in a Pulse Detonation Engine setup at PEC. The experiment was carried out by varying the amount of mass flow of acetylene and oxygen into the tube at different pressures in the settling chamber. The equivalence ratio of the acetylene-oxygen mixture with respect to the valve opening time of acetylene and oxygen was plotted. The analysis of equivalence ratio also defines the procedure which involved the cycle of valves and pressure supply to attain different values of filling fraction of the tube. The results experimentally predicted the feasible range of operation at different pressures in the settling chamber of the pulse detonation engine.

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Influence of Nozzle Type, Divergence Angle and Area Ratio on Impulse of Pulse Detonation Engine

INCAS BULLETIN ◽

10.13111/2066-8201.2020.12.2.4 ◽

2020 ◽

Vol 12 (2) ◽

pp. 35-45

Author(s):

Sanjeev Kumar DHAMA ◽

T. K. JINDAL ◽

S. K. MANGAL

Keyword(s):

Area Ratio ◽

Divergence Angle ◽

Nozzle Geometry ◽

Oxygen Mixture ◽

Pulse Detonation Engine ◽

Pulse Detonation ◽

Detonation Engine ◽

Shaped Nozzle ◽

Divergent Angle ◽

Thrust Stand

The influence of nozzle geometry on the impulse produced by the single cycle Pulse detonation engine (PDE) was experimentally investigated. For each experiment the nozzles were attached at the end of the engine. The impulse produced by the pulse detonation engine was calculated from the measured thrust. The thrust measurement was done by sliding the engine on the central bar of the thrust stand. The main structure of the basic PDE has a detonation tube with one terminal closed, a Schelkin spiral used as deflagration to detonation device, and a thrust stand to support the structure. Stoichiometric acetylene and oxygen mixture were used as detonation mixture. Various nozzles with a range of divergent angle and area ratios were tested. The calculations of the impulse were made from the thrust pulse for the duration it lasted. The effect of the type of nozzle, divergent angle and area ratio were observed. The bell shaped nozzle with large angle of divergence produced maximum specific impulse of 80 Sec with 20° divergence angle and area ratio of 6.942; maximum impulse was produced by the bell shaped nozzle with a small area ratio of 2.969 and 10° divergence angle. The maximum total impulse obtained was 1200 N-sec.

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Effect of equivalence ratio on the detonation noise characteristics of pulse detonation engine

International Journal of Turbo and Jet Engines ◽

10.1515/tjeng-2021-0016 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Gui-Yang Xu ◽

Bao-Xing Li ◽

Hong-Yan Li ◽

Yan-Fang Zhu ◽

Yi-Wen Guan ◽

...

Keyword(s):

Equivalence Ratio ◽

Great Influence ◽

Engineering Application ◽

Experimental System ◽

Noise Signal ◽

Pulse Detonation Engine ◽

Pulse Detonation ◽

Noise Characteristics ◽

Detonation Engine ◽

Set Up

Abstract The experimental system of pulse detonation engine (PDE) is set up to investigate the influence of equivalence ratios on detonation noise characteristics. The research results show that as the equivalence ratio increasing, the amplitudes of detonation noise in all angles and locations increase, and the tB also increases simultaneously, while the tA increases first and then decreases. The equivalence ratio also has a great influence on the intensity of the detonation noise signal in the frequency band of 10–100 Hz, which increases firstly and then decreases with the increase of the equivalence ratio, and the maximum value is obtained at equivalence ratio of 1.1. The results are of great significance to study the mechanism of detonation noise and promote the process of the engineering application.

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Study on Influence of Diameter on Detonation Acoustic Characteristics of Pulse Detonation Engine

International Journal of Turbo and Jet Engines ◽

10.1515/tjj-2020-0003 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Gui-yang Xu ◽

Chun-guang Wang ◽

Yan-fang Zhu ◽

Hong-yan Li ◽

Lun-kun Gong ◽

...

Keyword(s):

Acoustic Characteristic ◽

Pulse Detonation Engine ◽

Acoustic Characteristics ◽

Experiment System ◽

Pulse Detonation ◽

Impact Noise ◽

Maximum Duration ◽

Detonation Engine ◽

Set Up ◽

Different Diameters

AbstractThe experiment system of pulse detonation engine is set up to investigate on influence of diameter on detonation acoustic characteristic. The research of detonation acoustic characteristic of pulse detonation engine for four different diameters in different angles is carried out. Results from the test show that as the PDE diameter increasing, there are increases in amplitudes of impact noise in all angles, and the growth rate of amplitude of impact noise in the 90° direction is generally greater than that in the 0° direction. The smaller PDE diameter is, the distance of most obvious directivity at 0° turning to most obvious directivity at 30° is shorter. When the distance is shorter, such as 200 mm, the duration of detonation acoustic is increasing with the increase of PDE diameter, however, when the distance is longer, such as 3000 mm, it is just the opposite. The maximum duration of detonation acoustic is appeared in 3000 mm under 30 mm PDE diameter which reaches to 1.44 ms.

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