Measuring the Effect of Moist Droplet-laden Flow on Transonic Compressor Cascade Performance

Silvio Geist (1) , Niklas Neupert (1) , Franz Joos (1)

1 Helmut Schmidt University, University of the Armed Forces Hamburg

This study provides insight on the influence of air humidity on droplet laden flow as it occurs during inlet fogging and in steam turbines. D-LDA is used to gather air-only data at three different humidities to rate humidity-depended cascade losses such as shock and profile boundary layer losses. Likewise, change in aerodynamics is explained using a combination of isentropic and Rayleigh flow. Then, water droplets are added to the flow field and data is collected using D-PDA. Again losses are evaluated. Regarding the droplet-free flow, effects and relations found in literature could be confirmed for the presented cascade flow. However, the results further indicate that for droplet-laden flows favourable humidity effects are decreased and may be neglected since the major loss arises from the increased boundary layer thickness.

Mots clés: thermodynamics of two-phase flows; air-humidity; shock wave; condensation; evaporation

Domaines: Mécanique des structures [physics.class-ph]

Silvio Geist, Niklas Neupert, Franz Joos. Measuring the Effect of Moist Droplet-laden Flow on Transonic Compressor Cascade Performance. 17th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery (ISROMAC2017), Dec 2017, Maui, United States. ⟨hal-02390274⟩