Visualization of Valved Pulsejet Combustors and Evidence of Compression Ignition

Anand, Vijay; Jodele, Justas; Shaw, Vincent G.; Russell, Andrew; Prisell, Erik; Lyrsell, Owe; Gutmark, Ephraim

doi:10.1007/s10494-020-00203-4

Cited by 6 publications

(9 citation statements)

References 43 publications

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“…The fuel/air mixture was injected into the combustion chamber through the ten passages arranged in front of the combustor chamber as shown in the picture. According to the high-speed chemiluminescence results by Anand et al [51], the flame always covers the near wall region where the ion probe is mounted. This guarantees that the ion probe is able to measure the chemical reaction resulted ion signal regardless of the fuel flow rate.…”

Section: Actively Valved Resonant Pulse Combustor (Rpc)mentioning

confidence: 98%

Stability Characteristics of an Actively Valved Resonant Pulse Combustor

et al. 2021

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Section: Actively Valved Resonant Pulse Combustor (Rpc)mentioning

confidence: 98%

Stability Characteristics of an Actively Valved Resonant Pulse Combustor

et al. 2021

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“…The reason for this state of affairs could be both the level of complexity of the studied phenomenon, as well as the insufficient technological level of the then measuring equipment. In recent years, the dynamic development of measurement and imaging technologies has made it possible to carry out experiments that were previously difficult to perform [28][29][30][31][32]. Due to the great difficulty and complexity of the experimental studies of pulsating combustion chambers, numerical studies may be of invaluable help.…”

Section: Introductionmentioning

confidence: 99%

“…According to the authors of this article, it is particularly important to know the organization of the combustion process inside the chamber, as is the case with piston or turbine engines. In the cited literature review, it was approximated for one valve pulsating combustion chamber [28][29][30]. However, in these works, the authors do not control the operation of the tested engine in any way.…”

Section: Introductionmentioning

confidence: 99%

New Aspects of the Pulse Combustion Process

Gieras,

Trzeciak

2024

Energies

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Pulse combustion is an attractive yet still little-known form of combustion that can be successfully used in many industrial applications. Experimental studies show that the course of the combustion process in the valveless pulse combustion chamber is conditioned by the process of creating a well-mixed fuel–air mixture inside the chamber. In the paper, numerical calculations were carried out for selected operating conditions of the pulse chamber and compared with experimental results. This allowed for a better understanding and interpretation of the course of the pulsating combustion process itself. The role and importance of the rate of changes in the volume of the combustible mixture zone in the process of improving the efficiency of the combustion process were determined, and the reasons for changes in the pulsation frequency of the combustion process were also explained.

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“…Some of the authors previously cited highlight the analogy between a deflagrative PGC and an internal combustion engine (ICE). Anand [13] drew a parallel between fluidic piston movement in a pulsejet and an actual piston in ICE: the author defines the different operating phases using the idea of the Top Dead Center (TDC) from automotive engines field and affirms that pulsejet operates in a grey region between compression ignition and homogenous charge compression ignition engines. The similarities are even stronger with constant volume chambers, where opening and closing of valves separates the scavenging, suction, combustion, and exhaust phases.…”

Section: Introductionmentioning

confidence: 99%

“…The similarities are even stronger with constant volume chambers, where opening and closing of valves separates the scavenging, suction, combustion, and exhaust phases. Labarrere [13] investigated volumetric efficiency, heat losses to chamber walls, ignition, and influence of residual gases in a CVC chamber and highlights its similarities with a turbo-charged piston engine with a fixed piston position. Given the vast knowledge of combustion and ignition processes in ICE world for both numerical, experimental and data analysis, this parallelism can bring significant added value to the advancement of these novel combustors.…”

Section: Introductionmentioning

confidence: 99%

Experimental methodology for the characterization of a hydrogen-fuelled Pressure Gain Combustor

Tempesti,

Romani,

Ciampolini

et al. 2023

J. Phys.: Conf. Ser.

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Gas turbines have been a key technology in many industrial sectors for over 50 years and they will continue to play a crucial role in the energetic scenario. Nevertheless, these systems are approaching their efficiency limits and performance improvements are becoming increasingly difficult to achieve. In this context, Pressure Gain Combustion (PGC) has emerged as a promising technology: replacing the isobaric combustion with a quasi-isochoric process creates a rise in total pressure across the combustion chamber, enhancing their potential performances. However, it is a complex process influenced by combustion chemistry, heat transfer, and fluid dynamics, and its unsteadiness increases the complexity of measurement campaigns. Thus, several challenges still need to be addressed for its development. This paper shows the experimental methodology followed to characterize an innovative deflagrative-based PGC fuelled with 100% hydrogen. Dynamic pressure sensors were installed inside, upstream, and downstream of the combustion chamber and acquired at a high frequency (1 MHz) to describe in detail the process. Downstream the combustor, an orifice simulated the pressure drop across the turbine. Different fuel pressure has been tested, varying the operating parameters and the position of the pressure sensors inside the chamber. For each configuration, a detailed analysis of the mean pressure trends and cycle-to-cycle variation was carried out and will help optimize the system in the following tasks of the project. The experimental methodology described can be used to better investigate the physics of Pressure Gain Combustors and allow complete exploitation of their potentiality in terms of work extracted, resource consumption, and pollutant emission.

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Visualization of Valved Pulsejet Combustors and Evidence of Compression Ignition

Cited by 6 publications

References 43 publications

Stability Characteristics of an Actively Valved Resonant Pulse Combustor

Stability Characteristics of an Actively Valved Resonant Pulse Combustor

New Aspects of the Pulse Combustion Process

Experimental methodology for the characterization of a hydrogen-fuelled Pressure Gain Combustor

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