Design of an Actively Valved and Acoustically Resonant Pulse Combustor for Pressure-gain Combustion Applications

A Thermodynamic Analysis of the Pressure Gain of Continuously Rotating Detonation Combustor for Gas Turbine

“…Streamline 2 passed through the oblique shock wave beside the detonation wave. Streamline 3 passed through the lowest portion of the detonation wave and Streamline 4 passed through the highest portion of the detonation wave in the axial direction. From the inlet direction, the working fluid from region III passed through the detonation wave initially, then through the oblique shock wave.…”

“…Additionally, because the pressure gain in Brayton cycle-based gas turbines is mainly or only obtained by compressors, which are driven by turbines, the enhancement degree of gas turbine cycle efficiency can be further restrained by the thermodynamic performance of the combustor. In order to break through the bottleneck of constant pressure combustors on the thermal cycle performance of gas turbines, many advanced pressure gain and low entropy generation combustion technologies have been developed in recent decades, including resonant pulse [3], wave rotor [4][5][6][7], shockless explosion [8], and detonation [9].…”

A Preliminary Investigation of the Secondary Flame and Operational Properties of an Actively-valved Pulse Jet

“…Based on the inlet valve geometry, pulse combustors are usually classified into two categories, namely valveless [10,11] and valved [12,13]. Recently, Lisanti and Roberts [6,14,15] developed a novel actively valved pulse combustor with rotary valve for pressure gain combustion applications. The low mass passive valve was replaced with a ball shaped rotary valve allowing for much more durable operation.…”

“…With the results, a general concept of the operational properties of the actively valved pulse combustor with gaseous fuel were understood. In the previous work [6,14,15] all of the data collection was focused on a single axial location so that the variation along the axial location and the global sense of the combustion/acoustic coupling have not been elucidated. However, the combustion information in the downstream of the combustor shows an identical influence in governing the operational performance of the combustor.…”

“…However, the combustion information in the downstream of the combustor shows an identical influence in governing the operational performance of the combustor. For instance, regarding the operational principle of the Helmholtz-type pulse combustor, the recharge and compress process generated reversed flow of hot gases from the downstream may be one of the main reasons for the autoignition of fresh air/fuel mixture [8,14]. Another example can be found in the work by Geng at al.…”