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• Combustion-excited oscillations in a swirling thermoacoustic combustor is characterized. • Equivalence ratio is found to play a critical role on producing thermoacoustic oscillations. • Thermoacoustic eigenfrequencies are experimentally found to be shifted. • It is experimentally observed that thermoacoustic mode is switched between higher harmonic and fundamental one. • Nonlinear dynamics of thermoacoustic...
In aim to reduce the greenhouse-gas emissions and improve the low-grade heat efficiency, a modified CCHP (combined cooling, heating, and power) system is proposed using supercritical CO 2 . This cycle combines a Brayton cycle and a transcritical ejector refrigeration cycle by adding an extraction turbine. A mathematical model is developed to simulate the modified CCHP system. Parametric analysis...
Since the fixed ejector cannot adjust the optimum high-side pressure, the adjustable ejector is designed and built based on a transcritical CO 2 heat pump system model results. The adjustable ejector is subjected to electrical pulses through the stepper motor which drives needle forward or backward movement to change the nozzle throat area for the optimum high-side pressure. Experimental investigation...
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