Maximizing pressure recovery using lobed nozzles in a supersonic ejector

Ejector refrigeration: A comprehensive review

“…A large amount of studies is focusing on the role of nozzle shape for improving the performances. Some examples may be the rotorvane/pressure-exchange ejector [246], the petal nozzle [247], the lobel nozzle [248] and circle, cross-shaped, square, rectangular and elliptical nozzles [249]. Another work is the experimental investigation of Rao and Jagadeesh, testing Tip Ring Supersonic Nozzle and Elliptic Sharp Tipped Shallow nozzles [250] of the research of Zhu and Jiang on a bypass ejector [251].…”

Design of wind turbines with shroud and lobed ejectors for efficient utilization of low-grade wind energy

“…Li et al [41] pointed out that total-pressure recovery coefficient and thrust coefficient decreased with the increase in ratio of height to width. Opgenorth et al [42] investigated using the CFD method and through experiment the aerodynamic performance of 6 different lobes used in the supersonic lobed nozzles of a refrigeration system, and found that the pressure recovery ratio was 6.25 in the best case as compared to 4 for the baseline geometry. Wan [43] and Gu [44] studied solid and air tab techniques in a lobe mixer through PIV experiments and by using the RANS method, and found that the Air Tab technique could be used to increase the thermal mixing capacity and total pressure recovery coefficient of a turbofan engine.…”

Characteristics of air cooling for cold storage and power recovery of compressed air energy storage (CAES) with inter-cooling

“…Lin et al [18] found that the adjustable ejector using spindle to adjust the throat area of primary nozzle is an efficient solution to control the primary operating pressure in constant for system stability, and the pressure recovery ratio is sensitive to the varying of cooling loads. Opgenorth et al [19] improved the performance by enhanced mixing through flow instability by adding lobes to the circular nozzle design, combined with the profiling of the mixing channel, with the objective to determine the impact of the aspect ratio and total perimeter of the lobes on system pressure recovery and the entrainment ratio. And the authors found that increasing the perimeter beyond this value drives the frictional losses along the wall surfaces to dominate the process and the recovered pressure reduces back to the circular nozzle.…”