Fluid-heat-solid coupling numerical study on influence of gas-solid two-phase flow on elbow tube of gas-steam ejection power system
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摘要:
为了研究固体颗粒对弯管的影响，采用颗粒轨道模型计算弯管内气固两相流，并采用流热固耦合来计算弯管结构在两相流下的热力响应，最后研究了固粒粒径大小的影响。结果表明：固体颗粒在弯管外侧靠近出口端的位置相对聚集，导致聚集处内壁面温度提高约280 K，塑性应变则提高约60%，并且相应的局部疲劳寿命降低48%。粒径会影响固粒聚集颗粒平均体积分数及聚集位置附近的壁面温度、塑性应变。随着颗粒尺寸的增大，聚集颗粒平均体积分数会先提高后降低，导致聚集位置内壁温度和塑性应变先增大后减小，局部疲劳寿命先减小后增大，当粒径在8 µm左右时，这三个量达到极值，依次为1042 K、0.016697和244次循环寿命。
Abstract:In order to study the influence of particles on the elbow tube, the particle track model was used to calculate the gas-solid two-phase flow in the elbow tube, and the fluid-thermo-structure coupling model was applied to calculate the thermal response of the elbow tube under the two-phase flow. Finally, the influence of the particle size was studied. Results showed that solid particles were gathered on the region outside of the elbow tube near the outlet, such that the temperature and plastic strain of the inner wall at the gathering region rose about 280 K and 60%, with the corresponding local fatigue life decreasing by 48%. Particle size affected the aggregation location and concentration of solid particles, as well as the temperature and plastic strain of the wall near the aggregation location. As the particle size increased, the average volume fraction of the aggregated particles increased and then decreased, resulting in an increase and then a decrease in the internal wall temperature and plastic strain at the gathering region, with the opposite change in local fatigue life. These three quantities reached extreme values when the particle size was around 8µm, with 1042 K, 0.016697 and 244 cycle lives in that order.
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Key words:
- ejection power system /
- elbow tube /
- fluid-heat-solid coupling /
- flow field /
- temperature field /
- stress field
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图 3 气固两相流的马赫数和温度分布
Figure 3. Mach number and temperature distribution of gas-solid two-phase flow
图 4 单相流的马赫数和温度分布
Figure 4. Mach number and temperature distribution of single phase flow
图 6 两种流动下内壁温度分布对比
Figure 6. Comparison of temperature distribution at inner wall under two flows
图 7 弯管外壁面两测点处温度测量值与计算值
Figure 7. Measured and calculated temperatures at two measuring points on the outer wall of the elbow tube
图 8 两种流动下内壁上的等效塑性应变对比
Figure 8. Comparison of equivalent plastic strain distribution at inner wall under two flows
图 9 两种流动下沿外侧的壁温和等效塑性应变曲线
Figure 9. Wall temperature and equivalent plastic strain distribution along the outer side under two flows
图 10 两种流动下最大塑性应变处沿壁厚方向的等效塑性应变分布
Figure 10. Equivalent plastic strain distribution along the wall thickness at the location of maximum plastic strain under two flows
图 11 30 µm粒径下固粒分布和壁温分布
Figure 11. Solid particle distribution and wall temperature distribution for 30 µm particle size
图 12 100 µm粒径下固粒分布和壁温分布
Figure 12. Solid particle distribution and wall temperature distribution for 100 µm particle size
图 13 5 µm粒径下固粒分布和壁温分布
Figure 13. Solid particle distribution and wall temperature distribution for 5 µm particle size
图 14 不同粒径下沿外侧的壁温和等效塑性应变分布
Figure 14. Wall temperature and equivalent plastic strain distributions along the outer side for different particles sizes
图 15 单相流及不同粒径气固两相流下局部疲劳寿命计算
Figure 15. Calculation of local fatigue life for single phase flow and gas-solid two phase flows in different particle sizes
表 1 材料热物性参数
Table 1. Material thermo-physical parameters
材料名称 $ {\lambda }_{\mathrm{s}} $/（W/（m·K） ） $ {c}_{\mathrm{s}} $/（J/（kg·K）） $ {\rho }_{\mathrm{s}} $/（kg/m） 30CrMnSiA 27.63 473 7750 12Cr1MoV 42.7 611 7860 
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表 2 内壁表面网格尺寸无关性
Table 2. Inner wall surface mesh size independence
结构边界网格尺寸/mm 温度/K 上封头 0.5 697.9 1 652.5 0.25 699.7 弯管 0.35 555.9 0.7 554.8 0.175 556.1
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表 3 12Cr1MoV、30CrMnSiA材料机械性能
Table 3. Material mechanic properties of 12Cr1MoV, 30CrMnSiA
材料名称 $ \alpha $/10−6 K−1 $ \mu $ $ T $/K $ E $/GPa $ {\sigma }_{0.2} $/MPa ${ {E} }_{\mathrm{t} }$/GPa 12C1MoV 14.38 0.3 293 214 351 2.075 373 211 573 195 327 673 278 753 334 773 179 853 5.447 30CrMnSiA 13.9 0.3 293 196 945 1.363 473 177 523 840 573 167 820 673 162 785 773 3.201
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表 4 应变-寿命曲线参数
Table 4. Strain-life parameters curve
参数 数值 ${K}'/\mathrm{M}\mathrm{P}\mathrm{a}$ 558 ${n}'$ 0.086 ${\sigma }'_{\mathrm{f} }/\mathrm{M}\mathrm{P}\mathrm{a}$ 654 $ b $ −0.086 ${\varepsilon }'_{\mathrm{f} }$ 3.49 $ c $ −0.92
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