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首页> 外文会议>ASME Turbo Expo >INVESTIGATION INTO THE EFFECT OF UNCERTAINTY IN THERMAL PROPERTIES ON TURBOMACHINERY DISC HEAT TRANSFER USING BOTH A MONTE CARLO SIMULATION TECHNIQUE AND A TAYLOR SERIES UNCERTAINTY PROPAGATION METHOD
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INVESTIGATION INTO THE EFFECT OF UNCERTAINTY IN THERMAL PROPERTIES ON TURBOMACHINERY DISC HEAT TRANSFER USING BOTH A MONTE CARLO SIMULATION TECHNIQUE AND A TAYLOR SERIES UNCERTAINTY PROPAGATION METHOD

机译：使用蒙特卡罗仿真技术和泰勒串联不确定传播方法对涡轮机械盘传热进行热性能的影响

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The effect of uncertainties in the thermal properties of components and surrounding fluids is often ignored in the field of experimental turbomachinery heat transfer. The work reported here uses two different methods of uncertainty analysis to help quantify these effects: 1) a stochastic Monte Carlo simulation and 2) a Taylor series uncertainty propagation. These two methods were used on a steady state free disc test case having a turbulent flow regime. The disc modelled was made from IMI 318 titanium and had an inner and outer radius of 0.115 m and 0.22 m respectively, representative of engine and test rig geometry. The disc thickness was 0.016 m. Convective boundary conditions were derived from the relevant equation for local Nusselt number. The applied boundary conditions resulted in local heat transfer coefficients in the range of approximately 120 W/m~2 K to 170 W/m~2 K. Uncertainties for these heat transfer coefficients were a near identical match between the two different uncertainty methods and were found to be ± 0.66%. Calculated heat flux values fell within the range of Opproximately 1500 W/m~2 and 5200 W/m~2. The Monte Carlo uncertainty method returned uncertainty values varying from ± 1.17% to + 0.47% from the inner and outer radii respectively. An extended Taylor series of uncertainty propagation returned uncertainties varying from + 1.82% to + 0.96%, from the inner and outer radius respectively and increased and decreased a number of times in between. These differences are due to assumptions and simplifications which need to be made when using the Taylor series method and shows that a Monte Carlo simulation analysis offers a better way of quantifying the uncertainties associated with disc to air heat transfer as it is more realistic. Studying the magnitudes of uncertainty allows the analyst to understand the impact that uncertainties in thermal properties can have on calculated values of disc to air heat fluxes and heat transfer coefficients.
机译：在实验涡轮机械热传递领域通常忽略不确定性在组分和周围流体的热性质中的影响。报告的工作用两种不同的不确定性分析方法来帮助量化这些影响：1）随机蒙特卡罗模拟和2）泰勒序列不确定传播。在具有湍流状态的稳态自由盘式测试箱上使用了这两种方法。模型由IMI 318钛制成，分别具有0.115米和0.22米的内半径，代表发动机和试验台几何形状。盘厚度为0.016μm。对流边界条件源自当地营养数的相关方程。所施加的边界条件导致局部传热系数在大约120W / m〜2k至170w / m〜2k的范围内。这些传热系数的不确定性是两种不同的不确定性方法之间的近相同匹配发现为±0.66％。计算的热通量值下降在opproxaxive1500 W / m〜2和5200W / m〜2的范围内。 Monte Carlo不确定度方法分别从内半径和外半径恢复从±1.17％到+ 0.47％的不确定性值。扩展泰勒系列的不确定度传播分别从内半径和外半径恢复不确定性从+ 1.82％到+ 0.96％变化，并增加并降低了两者之间的多次。这些差异是由于在使用泰勒序列方法时需要进行的假设和简化，并且表明蒙特卡罗模拟分析提供了更好的方式来量化与光盘与空气传递相关的不确定性，因为它更为逼真。研究不确定性的幅度允许分析师了解热敏性中不确定性可以对空气热通量和传热系数的计算值的影响。

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