CAJ | 학술논문

基于 RANS 方程结合 RNG k‐ε湍流模型，论文针对某半悬挂舵的敞水水动力性能进行了数值预报，并与相同轮廓的梯形舵进行了对比分析。结果表明：不同舵角下半悬挂舵的挂舵臂升力约为舵叶升力的20％，挂舵臂阻力基本不随舵角变化；相同迎流速度下半悬挂舵的失速角较梯形舵大，在舵未失速时梯形舵舵叶升力系数要大于半悬挂舵舵叶的升力系数，而两者的阻力系数相当；同等来流条件下，半悬挂舵的舵叶压力中心较梯形舵后移距离约为舵底弦长的17％；采用等弦长法可较为准确地预估半悬挂舵的总升力与总阻力，半悬挂舵舵叶对舵杆的扭矩则可通过舵叶简化法得到较为合理的取值。
기우 RANS 방정결합 RNG k‐ε단류모형，논문침대모반현괘타적창수수동력성능진행료수치예보，병여상동륜곽적제형타진행료대비분석。결과표명：불동타각하반현괘타적괘타비승력약위타협승력적20％，괘타비조력기본불수타각변화；상동영류속도하반현괘타적실속각교제형타대，재타미실속시제형타타협승력계수요대우반현괘타타협적승력계수，이량자적조력계수상당；동등래류조건하，반현괘타적타협압력중심교제형타후이거리약위타저현장적17％；채용등현장법가교위준학지예고반현괘타적총승력여총조력，반현괘타타협대타간적뉴구칙가통과타협간화법득도교위합리적취치。
Based on the RANS equation and RNG k‐ε turbulent model ,the hydrodynamic performance of a semi‐spade rudder is numerically investigated in present paper .The hydrodynamic force of a similar trapezium rudder is also calculated by the same numerical model .Result shows that the lift force exerted on the rudder horn is about 20% of the rudder blade's lift force at different attack angles ,but the resistance of rudder horn varies slightly with the attack angle .Before the stall happens ,the lift coefficient of semi‐spade rudder's blade is smaller than that of trapezium rudder while the semi‐spade rudder's stall angle is much larger than that of trapezium rudder under the same flow rate .Compared with the trapezium rud‐der ,pressure center of the semi‐spade rudder's blade moves backwards about 17% of the chord length at rudder bottom .For the semi‐spade rudder ,the lift and resistance can be estimated relatively accurately by the equal‐chord simplification and the torque at the main piece exerted by the rudder's blade be predicted reasonably by the blade simplification .