Improving the Performance of an Active Valve Resonant Pulse Combustor

Lisanti, Joel C.; Zhu, Xuren; Roberts, William L.

doi:10.2514/6.2019-3871

Cited by 5 publications

(4 citation statements)

References 26 publications

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“…1 (c). More details of the actively-valved pulse combustor are available in previous work [10][11][12].…”

Section: Experimental Facilities and Measurement Instrumentationmentioning

confidence: 99%

“…In order to maintain measurement fidelity at the elevated temperatures reached during resonant operation, electronic thermal drift compensation was applied to the dynamic pressure transducer signal. For more details, readers are referred to the previous work [10][11][12].…”

Section: B Pressure Measurement Systemmentioning

confidence: 99%

“…Recently, the authors have developed an innovative actively-valved pulse combustor for pressure gain combustion [10][11][12]. By introducing a rotary ball valve, the lifetime of the pulse combustor was significantly extended compared to conventional pulse combustors using reed or flapper valves, whose movement is passively driven by the gases in the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

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Stability Characteristics of an Actively-valved Pulse Combustor

Zhu

Lisanti

Guiberti

et al. 2020

AIAA Propulsion and Energy 2020 Forum

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This work describes the stability characteristics of an actively-valved pulse combustor through experimental methods. An ion probe detected the combustion events and a pressure sensor measured the pressure wave in the combustion chamber. By decreasing the injected fuel flow rate to approach near blow-out limit and fixing the value frequency to 270 Hz, the stability characteristics of the pulse combustor was studied systematically. The time and frequency domains of the ion and pressure data show that with decreased fuel flow rate, the ion and pressure signals amplitude decrease, time traces show some discontinuity, and low frequency oscillations appear. We then quantified the stability characteristics by introducing two indexes: the integrated power spectrum density (PSD) and PSD ratio. The indexes provide direct evidence showing that the low frequency oscillation governs the combustion dynamics when approaching blowout limit. The strong low frequency oscillation is treated as the symptom of the near blowout. The present study can be used to guide the operation of the pulse combustor and avoid low frequency oscillations.

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“…1 (c). More details of the actively-valved pulse combustor are available in previous work [10][11][12].…”

Section: Experimental Facilities and Measurement Instrumentationmentioning

confidence: 99%

Section: B Pressure Measurement Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stability Characteristics of an Actively-valved Pulse Combustor

Zhu

Lisanti

Guiberti

et al. 2020

AIAA Propulsion and Energy 2020 Forum

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“…The highest loss source in conventional gas turbines occurs during the combustion phase when total pressure decreases causing a reduction of work potentiality [1] [2]. In this context, Pressure Gain Combustors (PGC) fit perfectly: these systems replace the isobaric combustion with a quasi-isochoric process in which total pressure rises across the combustion chamber.…”

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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