低矮火炬的空气需求、火焰高度和辐射负荷的估计

ISIS-3D General Comments

• Based on Computational Fluid Dynamics with radiative heat transfer and combustion chemistry
• Linked model is capable of simulating complex, three-dimensional objects engulfed in fires
• Provide reasonably accurate estimates of the total heat transfer to objects from large fires
• Predict general characteristics of temperature distribution in object
• Accurately assess impact of variety of risk scenarios (wind, % flame coverage, thermal fatigue for given geometry, etc.)
• Reasonable CPU time requirements on “standard” desktop LINUX workstation

Approach to Modeling Full Flare Fields

• Model Single Burner Test
• Perform Calibration Tests
• Calibrate Soot Yield and Reaction Parameters for Test Fuel
• Predict flame shape and size
• Model Multi-Burner Test
• Perform Radiation Calibration Tests
• Check Tip/Row Spacing
• Predict flame shape and size
• Model Full Flare Field
• Use Calibrated Soot Yield and Radiation Models
• Predict Flare Performance (Smoke Production/Air Demand)
• Predict Radiation Load on Wind Fence

总结

• ISIS-3D Model:
• Single-burner model used 110,000 cells
• Three-burner model used 188,000 cells
• Full-field model used 700,000 cells (Sustained Flow)
• 1,200,000 cell (Peak Flow)
• Combustion chemistry for propane, ethylene, mixed gas
• 用于单燃烧器和三燃烧器试验的3种燃料的模拟火焰形状/尺寸
• 与12次测试数据的比较预测（2个尖端尺寸、3个操作压力、2个辐射样本位置）
• 地面火炬辐射传热和空气需求的“合理”预计结果
• Air/fuel ratios range from 28 to 47 for 3-burner test and from 37 (Peak Flow Case) to 51 (Sustained Flow Case)
• Calibrated flare model applied to full-flare field to estimate:
• Air demand for specified tip/row spacing
• Radiation load on wind fence for nominal and peak flow cases
• Expected flame height and smoke production for nominal and peak flow cases