Abstract
This paper reports the results of a study on multi-recompression heating. This process employs a Roots-type mechanism to heat gases to very high temperatures by compressive gas heating. A CFD model predicting the leakage flows in the machine was developed, and an excellent comparison with experimental data taken on a two-lobe Roots blower was obtained. A “clearance analysis” was performed to show that the clearance between the impellers remains constant for 96% of the angles of rotation. Assuming a quasi-steady state, the CFD simulation was performed for a single angle of rotation. A three-dimensional analysis showed that the flow field is identical along the rotor length, except for the leakage through the end plates. Hence, the model was further simplified to a two-dimensional analysis. This research may provide guidance in predicting the leakage flows in other blowers of the same kind with a different geometry.
Highlights
The temperature rise due to compression, considered as undesirable in pumping applications, can be harnessed to produce an uncontaminated high-temperature (1500 K or higher), uniformly heated stream of gas
The multi-recompression heater (MRH) is a mechanical type heater, embodied as a modified Roots compressor, which works on the principle of compressive heating through multiple compressions of gas to create a high-temperature gas stream
A comprehensive clearance analysis was done of the two-lobe impeller geometry in the 404J Roots blower
Summary
The temperature rise due to compression, considered as undesirable in pumping applications, can be harnessed to produce an uncontaminated high-temperature (1500 K or higher), uniformly heated stream of gas. Many industrial applications require a clean, spatially uniform, hightemperature gas stream. Current technology used to heat gas does not provide a clean gas stream, nor does the stream spatially uniform in temperature. This results in disadvantages for various applications. The multi-recompression heater (MRH) is a mechanical type heater, embodied as a modified Roots compressor, which works on the principle of compressive heating through multiple compressions of gas to create a high-temperature gas stream. Pressure starts building up in the outlet region and a high-pressure reservoir is developed This causes “leakage” gas to flow back into the low-pressure region through the clearances. The presently reported research is to study this leakage flow in detail, with the aid of computational fluid dynamics
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