| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 651293 | Experimental Thermal and Fluid Science | 2015 | 10 Pages |
•CD nozzles with rectangular geometry at throat were investigated for application in Tesla turbines.•Internal flux in divergent section of planar nozzles was overexpanded with asymmetric separation.•At nozzles with divergent section circular the shock waves were canceled.•CD nozzles are an alternative to increase overall yield of Tesla turbines.
Convergent–divergent (CD) nozzles were designed and manufactured to improve the injection efficiency of the working fluid in Tesla turbines. Ten nozzles have been designed using two different techniques: a one-dimensional approach and a two-dimensional approach with the method of characteristics. All nozzles had rectangular geometry at throat, while 3 had divergent section planar and 2 divergent section circular, considering each mass flow rate (55 and 70 kg h−1). Nozzles were analyzed using air as the working fluid. A nozzle exit to throat area ratio (NAR) of 1.35 was used in all nozzles, while the nozzle pressure ratios (NPR) ranged between 2.15 and 3.25. At planar nozzles an (x/H)exit of 2.1 was more suitable for decreased of total pressure losses, while at circular nozzles the shock waves were canceled inside of divergent section.
