共查询到18条相似文献,搜索用时 171 毫秒
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为某型燃气轮机陆基试验台进气系统设计了一种由5个节流板组成的进气阻力模拟装置,用于模拟燃气轮机实船状态下的进气阻力。采用CFD数值模拟方法,分析该装置阻力模拟装置节流板不同偏转角度对燃气轮机进口空气流场及总压损失的影响,通过试验验证了数值模拟结果的准确性。数值结果表明:节流板顺时针持续偏转,下流底部回流区域逐渐扩大,下游主流流速分布较均匀,有利于燃气轮机运行;同时节流板偏转使得燃气轮机进口截面顶部区域低速区扩大,截面高速分布区域更加均匀。节流板逆时针偏转会增大燃气轮机进口截面不均匀度,且引起的总压损失要大于顺时针偏转,不利于燃气轮机运行。同时还通过试验验证了数值计算模型和相关分析的可靠性,为节流板的设计、安装提供了重要的理论依据。 相似文献
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对进气冷却在微型燃气轮机冷、电联供系统中的应用进行了研究.提出了用联供系统生产的冷能对压气机进口空气进行冷却来改善联供系统在高温天气下性能的方法,并结合具体算例进行了分析.结果表明:进气冷却可使微型燃气轮机在环境温度升高的情况下仍能稳定在设计工况点附近运行;环境温度越高,其对微型燃气轮机性能改善的效果越明显;余热供冷功率会因冷却空气而减少,但用微型燃气轮机比进气冷却前多发的电功率来驱动电空调制冷,可补偿制冷功率损失,并使系统总的供冷功率得到很大提高;进气冷却是高温天气下提高微型燃气轮机冷、电联供系统性能的有效措施. 相似文献
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当环境温度变化或燃气轮机进气加热时,燃气轮机逻辑中沃伯指数公式计算值保持不变,不能实时 反映燃气轮机的燃烧工况。通过分析燃气轮机DLN2.0 +燃烧系统的天然气校正沃伯指数公式,提出压气机 进气温度对校正沃伯指数更合理的修改公式。此新公式能全面正确反映环境温度变化或进气加热时的沃伯 指数变化,对现场实际运行和燃气轮机系统优化设计也有帮助。 相似文献
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为满足现代舰船对进气过滤系统越来越高的要求,针对进气滤清器的防浪级进行了大涡模拟(Large Eddy Simulation)。亚格子项采用Smagorinsky—Lilly亚格子模型,压力一速度耦合采用SIMPLE算法,空间离散采用中心差分格式,时间离散采用二阶精度的隐式差分格式,获得了反映流场特性的参数分布。与κ—ε湍流模型获得的结果相比较,大涡模拟得到的结果能更详细地反应流场特性。小型风洞上进行的性能实测结果表明数值模拟具有较高的精度,在燃气轮机进气系统的研究中是一种方便快捷的优化设计手段。 相似文献
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燃气轮机空气进气系统的主要功能是对空气进行过滤以达到机组使用要求,降低机组运行风险,并控制机组进气噪音和压降在相应的标准范围内。由于海上平台高湿度、高盐度的工作环境和使用年限的增加,某平台3MW燃气轮机发电机组空气进气系统存在空气进气质量差、风道腐蚀穿孔、夏季暴雨和冬春季大雾天气时易湿堵造成异常停机、过滤器更换频繁、维修量大等问题。针对这些问题,对燃气轮机发电机组空气进气系统进行了全面技术分析,并结合当前空气过滤相关的新技术,对燃气轮机空气进气系统进行了改造,采用三级过滤系统改善了空气进气质量。改造方案的成功实施对当前海上平台3~30MW的燃气轮机发电机组空气进气系统运维工作有良好的借鉴意义,该改造方案并已成功在其他平台6MW燃气轮机机组上成功实施。 相似文献
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与燃气轮机常规进气方式相比,舰用燃气轮机舷侧进气系统对风速、风向等环境条件更为敏感,从而影 响整体性能表现。为验证某舰用燃气轮机舷侧进气系统在不同进气方向下总体性能是否满足设计要求,本文搭 建了该进气系统比例模型,并在其中布置了滤清器、稳压室、消声器等损失部件模型,对舷侧进气系统在5个常 见的进气方向下的整体性能表现进行了试验研究,对M进气方向下7个关键截面上流场进行了详细测量。试 验结果发现,进气方向明显影响舷侧进气系统性能,进气方向垂直于百页窗时进气系统总阻力损失最小。进气 系统中前端部件,如百叶窗、滤清器、稳压室等部件流动损失受进气系统的影响较为明显,消声器等进气系统尾 端部件的流动损失基本不受影响。速度场测量结果表明,进气方向同样会影响进气系统出口截面上流动畸变情 况,变化趋势与进气系统总阻力损失变化趋势基本相反。试验结果表明,在不同进气方向下,舷侧进气系统设计 方案的总阻力损失、出口截面畸变、主机功率损失均满足设计要求。 相似文献
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《Journal of power sources》2006,158(1):455-463
This study analyses hybrid systems combining a molten carbonate fuel cell (MCFC) operating at ambient pressure and a gas turbine. Various possible system layouts, with the major difference among these layouts being the heating method of the turbine inlet gas, are proposed and their design performances are simulated and comparatively analyzed. Power of the MCFC in the hybrid system is explained in terms of the cathode inlet air temperature. Power of the gas turbine differs among various layouts because of large difference in the turbine inlet temperature. The direct firing in front of the turbine allows far higher turbine inlet temperature, and thus greater gas turbine power than the indirect heating of the inlet gas. The optimum pressure ratio of the directly fired system is higher than that of the indirectly fired system. The directly fired system allows not only much larger system power and higher optimum efficiency but also greater flexibility in the selection of the design pressure ratio of the gas turbine. In addition, the directly fired system can better accommodate the specifications of both current micro gas turbines and advanced gas turbines than the indirectly fired system. 相似文献
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Combined cycle configuration has the ability to use the waste heat from the gas turbine exhaust gas using the heat recovery steam generator for the bottoming steam cycle. In the current study, a natural gas‐fired combined cycle with indirectly fired heating for additional work output is investigated for configurations with and without reheat combustor (RHC) in the gas turbine. The mass flow rate of coal for the indirect‐firing mode in circulating fluidized bed (CFB) combustor is estimated based on fixed natural gas input for the gas turbine combustion chamber (GTCC). The effects of pressure ratio, gas turbine inlet temperature, inlet temperatures to the air compressor and to the GTCC on the overall cycle performance of the combined cycle configuration are analysed. The combined cycle efficiency increases with pressure ratio up to the optimum value. Both efficiency and net work output for the combined cycle increase with gas turbine inlet temperature. The efficiency decreases with increase in the air compressor inlet temperature. The indirect firing of coal shows reduced use with increase in the turbine inlet temperature due to increase in the use of natural gas. There is little variation in the efficiency with increase in GTCC inlet temperature resulting in increased use of coal. The combined cycle having the two‐stage gas turbine with RHC has significantly higher efficiency and net work output compared with the cycle without RHC. The exergetic efficiency also increases with increase in the gas turbine inlet temperature. The exergy destruction is highest for the CFB combustor followed by the GTCC. The analyses show that the indirectly fired mode of the combined cycle offers better performance and opportunities for additional net work output by using solid fuels (coal in this case). Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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为满足燃气轮机试验台配置模拟海洋大气环境装置的需求,设计了试验台盐雾系统。该系统通过蠕动泵输送燃气轮机各工况所需要的盐溶液,盐溶液输送至雾化器内雾化后形成盐雾,盐雾在燃气轮机进气道中与燃气轮机吸入的空气混合后进入压气机。在20%,35%,50%,60%,80%和100%等额定功率工况下对压气机进口空气含盐质量分数进行测量计算,压气机进气含盐质量分数均约为0.01×10-6,验证了系统满足燃气轮机全功率工况空气含盐质量分数的模拟要求。 相似文献