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| 山火脉动热流平均化对钢芯铝绞线等效退火作用影响的数值模拟 |
| Numerical Investigation of the Effects of Averaging Wildfire Heat Flux on Equivalent Annealing in ACSR Conductors |
| 投稿时间：2026-08-27 修订日期：2026-10-01 |
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| 基金项目:国家电网有限公司总部管理科技项目资助(5200-202420089A-1-1-ZN) |
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| 中文关键词: 山火 钢芯铝绞线 脉动热流平均化 等效退火作用比 经验关系式 |
| 英文关键词:wildfire aluminum conductor steel-reinforced (ACSR) pulsating heat-flux averaging equivalent annealing-effect ratio empirical correlation |
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| 中文摘要: |
| 为研究山火脉动热流平均化对钢芯铝绞线退火作用评估的影响,本文建立并验证导线径向瞬态传热模型。基于温度加权的累积等效退火时间,分别表征了脉动热流与平均热流的等效退火作用,并将两种热流下的等效损伤之比定义为等效退火作用比KA,用于定量分析热流和导线特征六个参数的影响。结果表明,温度波动主要集中于导线表层并向内部衰减；全部有效工况的KA均大于1,表明平均热流低估脉动热流对应的等效退火作用。KA随脉动幅值、热流峰值和表面发射率增大而增大,随脉动频率、作用时间和径向导热系数增大而减小。基于68组有效单因素工况和45组有效交叉工况建立了KA的经验性预测关系式,适用于本文参数范围内未达到铝熔点工况的等效退火作用比估算。 |
| 英文摘要: |
| To investigate the effect of averaging pulsating wildfire heat flux on the assessment of annealing effects in aluminum conductor steel-reinforced (ACSR) conductors, a radial transient heat-transfer model was developed and validated. Based on the temperature-weighted cumulative equivalent annealing time, the equivalent annealing effects under pulsating and averaged heat fluxes were evaluated separately. Their ratio was defined as the equivalent annealing-effect ratio KA to quantify the effects of six parameters characterizing the heat flux and conductor properties. The results show that temperature fluctuations are mainly concentrated near the conductor surface and attenuate inward. The KA values exceed 1 for all valid cases, indicating that the averaged heat flux underestimates the equivalent annealing effect induced by the pulsating heat flux. KA increases with pulsation amplitude, peak heat flux, and surface emissivity, but decreases with pulsation frequency, exposure duration, and radial thermal conductivity. An empirical predictive correlation for KA was established using 68 valid single-factor cases and 45 valid cross-parameter cases. The correlation can be used to estimate the equivalent annealing-effect ratio for cases in which the conductor surface temperature remains below the aluminum melting point within the parameter ranges investigated in this study. |
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