A116 CONVECTIVE HEAT TRANSFER AND FLOW PATTERN IN A SIMULATED TUBE-NESTED COMBUSTOR(Advanced thermal system analysis-2)

概要

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In a tube-nested combustor for a compact water-tube boiler, water tubes are placed closely to the burner and thus conventional empty furnace is, in principle, removed. This type of boiler, on one hand, reduces significantly NOx emission, but on the other hand the convective heat transfer characteristics become a key design factor owing to the compactness of boiler and related complexity of the flow pattern. The flow pattern depends on re-circulations around the burner. Then, a cold model test has been conducted to understand the fundamental characteristics of flow pattern, heat transfer, and structure of re-circulations flow at around the burner, using full-scale simulated tube-nested combustor. From flow visualization experiments, a stable and symmetric re-circulation flow at the burner exit is observed in a suitable tube arrangement, and the three-dimensional structure of this re-circulation is revealed. The re-circulation flow can be controlled by the tube arrangement at the burner exit.
一般社団法人日本機械学会の論文
2000-10-01