时烽超，王玺，裴蓓. 约束条件对管道内生物气/空气预混气爆炸特性影响研究[J].河南理工大学学报(自然科学版), doi:10.16186/j.cnki.1673-9787.2025060049.

SHI F C, WANG X, PEI B. Effects of constraints on explosion characteristics of biogas/air premixed gas in duct [J]. Journal of Henan Polytechnic University (Natural Science), doi:10.16186/j.cnki.1673-9787.2025060049.

约束条件对管道内生物气/空气预混气爆炸特性影响研究

(网络首发)

时烽超¹，王玺¹，裴蓓^1,2

（1.河南理工大学 安全科学与工程学院，河南 焦作 454000；2. 煤炭安全生产与清洁高效利用省部共建协同创新中心，河南 焦作 454000）

摘要: 目的 可再生能源生物气的应用日益广泛，其燃烧爆炸危险性受到学界的高度关注，为了给生物气的安全利用提供理论依据，深入探究约束条件对不同组分生物气爆炸特性的影响，明晰泄爆后火焰传播规律和压力演化机制。 方法 针对生物气储运中典型的大长径比管道场景，实验在自主搭建的大长径比管道装置中开展。该管道左端采用不同层数的PVC薄膜密封（薄膜厚度随层数线性递增），右端保持封闭状态，通过调控约束端薄膜层数与生物气成分组成，系统研究爆炸参数的变化规律。 结果 结果表明，PVC薄膜层数对预混气超压峰值的影响要远大于CH₄体积分数的影响。随着约束端PVC薄膜层数从1层增加到9层，预混气的压力波波形变化明显，逐渐由双峰型向单峰型过渡，3层为关键分界点。与提升CH₄体积分数相比，增加薄膜层数可更有效地提高最大压力增长率。生物气中CH₄体积分数对火焰传播时间和前锋速度的影响占主导地位。固定薄膜层数时，最大火焰瞬时速度随CH₄体积分数增加呈线性上升，传播时间则相应缩短。预混气爆炸过程中，火焰前锋速度、空间位置与压力波动的动态变化，与火焰结构的湍流演化存在强耦合性。 结论 研究结果明确了约束强度与生物气组分对爆炸特性的调控规律，这可为生物气储存运输设施的安全设计、泄爆装置优化及工程应用中的风险防控提供了重要的理论支撑与技术参考。。

关键词: 生物气；爆炸特性；郁金香火焰；约束条件；超压

中图分类号：TD712.7

doi: 10.16186/j.cnki.1673-9787.2025060049.

基金项目: 国家自然科学基金资助项目（52474216）

收稿日期：2025-06-30

修回日期：2025-11-14

网络首发日期：2025-12-04

Effects of constraints on explosion characteristics of biogas/air premixed gas in duct (Online)

Shi Fengchao¹, Wang Xi¹, Pei Bei^1,2

(1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo 454000，Henan，China；2. State Collaborative Innovation Center of Coal Work Safety and Clean-Efficiency Utilization，Jiaozuo 454000，Henan，China)

Abstract: Objectives With the increasing application of renewable energy biogas, its combustion and explosion hazards have drawn significant attention. This study is intended to deeply investigate the influence of constraint conditions on the explosion characteristics of biogas with different compositions, clarify the variation laws of flame propagation and pressure evolution after deflagration, and promote the safe utilization of biogas. Methods Aiming at the typical pipeline scenario with a large length-diameter ratio in biogas storage and transportation, experimental investigations were carried out in a self-constructed pipeline with a large length-diameter ratio. The pipeline was sealed with PVC films of varying layers at the left end (film thickness increasing linearly with layers) and closed at the right end, enabling systematic analysis of explosion parameters by regulating the film layers and methane concentration in the mixture. Results The number of PVC film layers exerts a more significant influence on the overpressure peak of premixed gas than CH₄ content. As the layers increase from 1 to 9, the pressure waveform transitions from bimodal to unimodal with 3 layers as the critical threshold. Increasing film layers enhances the maximum pressure growth rate more effectively than elevating methane concentration. CH₄ content in biogas dominates the influence on flame propagation time and front velocity. At a fixed number of film layers, the maximum instantaneous flame velocity increases linearly with CH₄ content, while the propagation time decreases accordingly. The dynamic changes in flame front velocity, position, and pressure during premixed gas explosion are strongly correlated with the turbulent evolution of flame structure. Conclusions This study clarifies the regulatory laws of constraint strength and biogas components on explosion characteristics, and it provides critical theoretical foundations and technical references for safety design of biogas storage/transportation facilities, optimization of deflagration venting devices, and risk prevention in engineering applications.

Key words：biogas; explosion characteristic; tulip flame; constraint condition; overpressure

CLC: TD712.7