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学者姓名：李福气
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Abstract ：
In lumbar anesthesia surgery, the accurate determination of key parameters such as injection angle and dosage is facilitated by the real-time observation of intrathecal drug distribution. In this study, a non-invasive and visual computational fluid dynamics method was used to simulate drug injections in the "cloverleaf" lumbar thoracic segment with a multiphase mixture model, clarifying the intrathecal unsteady flow behaviors and the drug transport mechanisms. The transport properties of three clinically significant injection angles - 0 degrees, 45 degrees and 60 degrees- were compared, determining the fastest and slowest block onset angles based on drug concentration levels in the thoracic vertebral plane. The calculation results are aligned with clinical practice trends, and it is found that significantly different drug amounts are required for different injection angles, with higher doses necessitated for ultrasound-assisted anesthesia. During anesthesia, a trend of increasing and then decreasing local anesthetic concentrations in each vertebral plane was observed, with the presence of a minimum effective dose of local anesthetic at the target block site. Injecting at the "concave" part of the cloverleaf (45 degrees and 60 degrees) results in greater drug pulsation, faster diffusion and more efficient mixing than injecting at the positive "convex" part of the cloverleaf cross-section (0 degrees). At the L2 vertebral plane, the flow rate and mixing ratios during injection for angles of 0 degrees, 45 degrees and 60 degrees were approximately 1:4:2. Compared with orthostatic 0 degrees injections, 45 degrees and 60 degrees oblique injections resulted in higher drug concentrations in the T12-10 vertebral plane during the pre-transport period, with 45 degrees injections being the fastest. However, over a longer period of time, 45 degrees injections resulted in the lowest drug concentrations in the target block plane (T10), necessitating a higher dose. A faster anesthetic response was produced by 0 degrees injections at the same dose. Valuable insights for the application of appropriate drug dosages in clinical anesthesia practice are offered by the calculations.
Keyword ：
computational fluid dynamics computational fluid dynamics drug transport drug transport injection angle injection angle Spinal anesthesia Spinal anesthesia
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| GB/T 7714 | Li, Yuzheng , Xu, Qiyue , Zhang, Xing et al. Numerical investigation on the differential injection angle effects of intrathecal anesthetic drug delivery [J]. | INTERNATIONAL JOURNAL OF MODERN PHYSICS C , 2025 , 36 (11) . |
| MLA | Li, Yuzheng et al. "Numerical investigation on the differential injection angle effects of intrathecal anesthetic drug delivery" . | INTERNATIONAL JOURNAL OF MODERN PHYSICS C 36 . 11 (2025) . |
| APA | Li, Yuzheng , Xu, Qiyue , Zhang, Xing , Li, Fuqi , Zheng, Ting , Zheng, Chunying et al. Numerical investigation on the differential injection angle effects of intrathecal anesthetic drug delivery . | INTERNATIONAL JOURNAL OF MODERN PHYSICS C , 2025 , 36 (11) . |
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Abstract ：
The present study proposes a pressure decomposition framework designed to decouple hydrodynamic and acoustic components from sparse acoustic measurement data, effectively identifying the flow-induced noise of a confined orifice in lithography. The framework involves three primary steps: peak detection, mode decomposition, and component identification. By employing spectral analysis and spectral proper orthogonal decomposition, the framework extracts key information on discrete tonal frequencies, amplitudes, and waveforms, reconstructing coupled hydrodynamic and acoustic pressures into new modal representations. Component decomposition is further achieved through wavenumber-frequency spectrum analysis, revealing the characteristic phase velocity of the reconstructed modes. An acoustic experiment was conducted using a microphone array to evaluate the noise identification performance. The findings indicate four characteristic zones within the fluid dynamic and acoustic pressure pulsations, with acoustic components prevailing in the low and mid-frequency ranges, particularly associated with large-scale vortex structures. Finally, the production mechanisms of the identified hydrodynamic and acoustic pressure pulsations were further revealed by solving the eigenvalue problem of the compressible linearized Navier-Stokes equations in the frequency domain. The results support that the decomposed sound pressure features a low attenuation factor, allowing for long-distance propagation with minimal loss.
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| GB/T 7714 | Zhang, Haoyuan , Li, Fuqi , Wang, Peng et al. Noise identification of confined orifice flow from sparse experimental data using a pressure decomposition framework [J]. | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA , 2025 , 157 (5) : 3402-3417 . |
| MLA | Zhang, Haoyuan et al. "Noise identification of confined orifice flow from sparse experimental data using a pressure decomposition framework" . | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 157 . 5 (2025) : 3402-3417 . |
| APA | Zhang, Haoyuan , Li, Fuqi , Wang, Peng , Wen, Xin , Liu, Yingzheng . Noise identification of confined orifice flow from sparse experimental data using a pressure decomposition framework . | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA , 2025 , 157 (5) , 3402-3417 . |
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Abstract ：
压力脉动主动抑制是提升数字液压阀控系统控制精度和可靠性的关键技术.然而,目前主动抑制方法在对压力脉动进行抑制时缺乏对其特性的深入理解,导致抑制效果不理想.因此,设计了压力脉动测试试验台,分析了系统中不同位置压力脉动的变化情况,探索了液压泵、高速开关阀对不同位置压力脉动的影响.结果表明:数字液压阀控系统中压力脉动的主要来自于高速开关阀持续开/关引起的水击现象,并且压力脉动的频率始终与阀的开/关频率保持一致.为设计前馈的压力脉动主动抑制系统提供了新思路,同时也为研发更高效的压力脉动衰减器提供了参考.
Keyword ：
压力脉动 压力脉动 数字液压 数字液压 试验分析 试验分析 高速开关阀 高速开关阀
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| GB/T 7714 | 陈福龙 , 杜恒 , 李雨铮 et al. 数字液压阀控系统中压力脉动试验 [J]. | 液压与气动 , 2024 , 48 (10) : 136-142 . |
| MLA | 陈福龙 et al. "数字液压阀控系统中压力脉动试验" . | 液压与气动 48 . 10 (2024) : 136-142 . |
| APA | 陈福龙 , 杜恒 , 李雨铮 , 周时钊 , 李福气 , 马玉山 . 数字液压阀控系统中压力脉动试验 . | 液压与气动 , 2024 , 48 (10) , 136-142 . |
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In this study, the flow behaviors and throttle effects of high-pressure air flow through orifices were experimentally investigated in a pipe system and numerically simulated using Reynolds-averaged Navier-Stokes equations with the shear stress transport (SST) k-omega turbulence model. Three orifice configurations with porosities (orifice hole area to pipe area ratio) of beta = 28.4%, 7.1%, and 1.8% were comparatively evaluated under four different inflow pressures, i.e., p(in)= 1, 2, 3, and 4 bar. The numerical results agreed well with the corresponding experimental measurements. A primary recirculation with a smaller secondary recirculation region was formed immediately behind the trailing face. In the presence of supersonic flow, the streamwise velocity exhibited periodic oscillations, increasing at the expansion wave and decreasing at the shock wave region. The throttle effects were highly sensitive to the orifice porosities and the inflow conditions. In the beta = 28.4% configuration, shock waves and expansion waves were evident under different inflow pressures and alternately dominated the downstream flow, leading to periodic streamwise temperature variations, with the minimum temperature reaching -160 degrees C at p(in)= 4 bar. For the orifice with beta = 7.1%, the expansion and shock waves appeared at p(in)>= 2 bar, and continuously expanded with intensified flow fluctuations at p(in)= 3 and 4 bar, with the minimum temperature reaching -120 degrees C. For the orifice with beta = 1.8%, the impact of shock waves on the temperature field was barely observable under p(in)= 1 and 2 bar due to the small porosity. When p(in)>= 3 bar, similar temperature patterns with larger-porosity orifices were observed downstream of the orifice trailing face but were smaller in size.
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| GB/T 7714 | Li, Fuqi , Shu, Weilin , Xu, Zhaoyang et al. Flow behaviors and throttle effects of high-pressure air flow through orifices [J]. | PHYSICS OF FLUIDS , 2024 , 36 (12) . |
| MLA | Li, Fuqi et al. "Flow behaviors and throttle effects of high-pressure air flow through orifices" . | PHYSICS OF FLUIDS 36 . 12 (2024) . |
| APA | Li, Fuqi , Shu, Weilin , Xu, Zhaoyang , Liu, Bang , Zhang, Ji , Hu, Zhiqiang et al. Flow behaviors and throttle effects of high-pressure air flow through orifices . | PHYSICS OF FLUIDS , 2024 , 36 (12) . |
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Abstract ：
孔板作为首选的流量调节元件,广泛应用于液压与气动管路、机舱气流调节系统及新能源液冷管路等领域。然而,多尺度旋涡结构周期性形成、输运和掺混等,将形成强烈各向异性的时空演化特性;当其受制于结构约束时,将诱导局部压力脉动形成各频率噪声并快速传播,甚至在一定条件下出现流场周期性振荡,导致强烈压力脉动形成反馈强化的自激噪声。为了能够精准获取孔板管路的非定常流场特征和气动噪声传播特性,本研究设计并搭建了用于孔板管路湍流噪声同步测量的流致噪声实验台,通过麦克风线性阵列同步测量技术,模拟实际工况对孔板管路进行动态压力脉动测量。同时,为了深入分析孔板管路的非定常流场的时空演变特征,基于动态DDES数值模型对孔板管路非定常流场进行了高保真声源模拟,基于声类比理论实现孔板管路流致噪声沿管路传播的特征预测,并结合流场模态分析方法,深入揭示了孔板管路流致噪声的产生及传播机理。本研究旨在研究并归纳满足流量控制需求并降低流致噪声的管路孔板几何结构及布局方式,从而深入揭示孔板湍流结构时空演化及流致噪声机理,进而探索有效降噪方案,为相关工程应用提供科学指导。
Keyword ：
孔板管路 孔板管路 流致噪声机理 流致噪声机理 非定常流场结构 非定常流场结构 麦克风线性阵列 麦克风线性阵列
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| GB/T 7714 | 李福气 , 张昊原 , 王鹏 et al. 孔板管路非定常流动与流致噪声机理研究 [C] //第十三届全国流体力学学术会议 . 2024 . |
| MLA | 李福气 et al. "孔板管路非定常流动与流致噪声机理研究" 第十三届全国流体力学学术会议 . (2024) . |
| APA | 李福气 , 张昊原 , 王鹏 , 李雨铮 , 刘应征 . 孔板管路非定常流动与流致噪声机理研究 第十三届全国流体力学学术会议 . (2024) . |
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