This research article investigates the effect that hydrodynamic cavitation has on flow-boiling characteristics in a single micro-channel. Flow and heat transfer characteristics have been investigated over a range of effective heat fluxes (71-330 W/cm 2) and vapor quality (0.25-0.92) over a broad range of mass flow rates. The images of flow condition have been photographed. A fully developed cavitation flow, including inception, growth, and collapse of bubble, can be presented in the micro-channel. The intensity of bubble and length of the two-phase region increase with increase in the mass flow rates, and bubble flow pattern dominates the fully developed cavitation flow. Heat transfer coefficient has also been calculated at experimental conditions, and the coefficients decrease with increase in the vapor quality, but increase with increase in the heat fluxes.
The centrifugal compressor is the core component of supercritical CO2 power cycle, and its performance and operation stability are research hotspots. However, there are few experimental studies, especially for compressors used in Mwe-scale power cycles. In this paper, based on a 1 MWe supercritical CO2 power cycle, a single-stage centrifugal supercritical CO2 compressor is designed with speed of 40,000 RPM, a pressure ratio of 2.5 and a mass flow of 16.3 kg/s. In order to carry out the compressor test, a general experimental platform for MWe sCO2 compressors is built. In the test, the mass flow range is 13.5~18 kg/s and the maximum experimental pressure ratio is close to 2.0. The performance curve of the compressor of 31,000 ± 1000 RPM is obtained, and the historical curve of the experiment is given. Then, the experimental curve is compared with the design curve using a dimensionless method. The isentropic head coefficient of the experimental curve is lower than the design value, and the experimental curves shift towards the boundary of small flow coefficient. Finally, the influence of compressor inlet condensation on compressor performance and the change of operating boundary is preliminarily explained.
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