Open AccessInfluence of inlet flow field uniformity on the performance of the nuclear main pump
Author(s) -
Long Sha,
Shengqiang Yang,
Xianwen Kong,
Hui Sun,
Pei Lin
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1081/1/012024
Subject(s) - impeller , mechanics , inlet , rotational speed , rotation (mathematics) , volumetric flow rate , deflection (physics) , flow (mathematics) , optics , materials science , simulation , geometry , mathematics , physics , engineering , mechanical engineering
A test loop system with adjustable spoiler function and visual structure was built in this paper. A PIV test system was adopted to investigate the influence of the uniformity of the inlet flow field on the performance of a nuclear main pump scale model, and the NUMECA software was used to numerically simulate the test cases. The research results show that when the rotation direction of the spoiler blade is opposite to that of the impeller, the greater the deviation of the spoiler blade from the axial angle, the more the pump efficiency and head drop; proper positive pre-rotation will not reduce the pump efficiency, but will increase the pump head; for the same spoiler blade deflection angle, when its structure produces irregular flow field disturbances under non-centrosymmetric conditions, the flow field downstream of it will not produce clear swirling flow, and it will not have more impact on the performance of the pump; the axial velocity distribution uniformity δ and the velocity weighted average angle θ, θ’ have obvious direct effects on efficiency, and in the δ interval of each working condition in this paper (the difference between the maximum value and the minimum value of δ is 0.093), the speed weighted average angle has a greater impact on efficiency. Nomenclature. Q Rate of flow δ Axial velocity distribution uniformity θ Weighted average angle parameter of velocity θi Absolute axial velocity angle θ′ Weighted average angle parameter of velocity η Efficiency H Head