Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4925310 | Nuclear Engineering and Design | 2017 | 8 Pages |
Abstract
The swirler and the 1st pick-off ring (POR) of a gas-liquid separator are improved to reduce the pressure drop, ÎPT, in the separator while keeping the flow rate of separated liquid, WST, high. Two swirler designs are presented, i.e. V8 (swirler with eight vanes) and V6 (swirler with six vanes), whose diameters of the hubs supporting the vanes are smaller than that of the normal swirler, N8, and the nose shape of vanes are coned. The swirlers are installed into a one-fifth scale separator with three PORs. The gap width of the 1st POR is reduced to the value of the liquid film thickness in the barrel of the separator and the rear shape of the 1st POR is smoothed. The performance of the downscaled separator with the proposed swirlers and the 1st POR are evaluated under the nominal operating condition of the Hyper BWR and a higher quality condition. As a result, the following conclusions are obtained in the present experimental range: (1) ÎPT in the separator is reduced by 23% using V8, and V8 gives the same WST as N8, confirming that the decrease in the hub diameter and the coned-nose shape of vanes are effective, (2) V6 can realize further reduction of ÎPT (38%) without deteriorating the liquid-separation rate, (3) the reduced gap width of the 1st POR and a tapered shape of the downstream side of the 1st POR are also effective to decrease the pressure drop, i.e. the improved POR decreases ÎPT by 42% and 54% by combining with V8 and V6, respectively, and (4) the improved separators also show good performances in ÎPT and WST at the higher quality condition.
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Physical Sciences and Engineering
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Authors
H. Funahashi, K. Hayashi, S. Hosokawa, A. Tomiyama,