A fan-stirred combustion chamber is developed for spherically expanding flames, with P and T up to 10 bar and 473 K, respectively. Turbulence characteristics are estimated using particle image velocimetry (PIV) at different initial pressures (P = 0.5–5 bar), fan frequencies (ω = 0–2000 r/min), and impeller diameters (D = 100 and 114 mm). The flame propagation of methanol/air is investigated at different turbulence intensities (u′ =0–1.77 m/s) and equivalence ratios (ϕ = 0.7–1.5). The results show that u′ is independent of P and proportional to ω, which can be up to 3.5 m/s at 2000 r/min. L_T is independent of P and performs a power regression with ω approximately. The turbulent field is homogeneous and isotropic in the central region of the chamber while the inertial subrange of spatial energy spectrum is more collapsed to −5/3 law at a high Re_T. Compared to laminar expanding flames, the morphology of turbulent expanding flames is wrinkled and the wrinkles will be finer with the growth of turbulence intensity, consistent with the decline of the Taylor scale and the Kolmogorov scale. The determined S_L in the present study is in good agreement with that of previous literature. The S_L and S_T of methanol/air have a non-monotonic trend with ϕ while peak S_T is shifted to the richer side compared to S_L. This indicates that the newly built turbulent combustion chamber is reliable for further experimental study.

风扇搅拌燃烧室是为球形膨胀火焰开发的，P和T 分别高达 10 bar 和 473 K。在不同的初始压力 ( P = 0.5–5 bar)、风扇频率 ( ω = 0–2000 r/min) 和叶轮直径 ( D = 100 和 114 mm) 下，使用粒子图像测速法 (PIV) 估计湍流特性。在不同的湍流强度 ( u' = 0–1.77 m/s) 和当量比 ( ϕ = 0.7–1.5) 下研究了甲醇/空气的火焰传播。结果表明u′与P无关并与ω成正比，在 2000 r/min 时可达 3.5 m/s。L _T与P无关，并使用ω近似执行幂回归。湍流场在腔室的中心区域是均匀和各向同性的，而空间能谱的惯性子范围在高Re _{T 时}更倾向于-5/3 定律。与层流扩展火焰相比，湍流扩展火焰的形态是褶皱的，随着湍流强度的增加褶皱会越来越细，这与泰勒标度和柯尔莫哥洛夫标度的下降一致。所确定的小号_大号在本研究与以前的文献吻合。在小号_大号和S _T的甲醇/空气具有与ϕ的非单调趋势，而与S _L相比，峰S _T移向更丰富的一侧。这表明新建的湍流燃烧室是可靠的，可用于进一步的实验研究。