Fabrication, Operation and Data Analysis of the University of Denver Low Turbulence Inlets on the NCAR C-130 for ACE-Asia

两个用于NCAR C-130飞机的低湍流进气道(LTI)将在ACE-ASIA计划(亚洲气溶胶特性实验)期间制造和部署。这些进气口允许气溶胶样品从飞机的真实风速(大约100m/S)减慢到几米/S，而不会使样品在扩散器中受到湍流沉积。这种湍流的减少是通过扩散器中的边界层吸力来实现的。将安装一个吸力流量控制系统，以便在飞机运行参数改变时保持所需的样品流量。我们将收集表征进气性能的数据，并将其用于计算净增强因子，其中包括扩散器中大颗粒的各向异性采样和惯性增强的影响。这些新的进气口将首次允许对亚微米和超微米尺寸的大气气溶胶进行空中采样，而不会造成较大颗粒的湍流损失。即使大颗粒实际上会被这些进水口增强，也有可能量化它们的浓度，因为增强是可以计算出来的。在ACE-Asia完成后，这些入口将向NCAR/ATD和社区提供，供未来的计划使用。

Two low-turbulence inlets (LTIs) for use on the NCAR C-130 aircraft will be fabricated and deployed during the ACE-Asia program (Aerosol Characterization Experiment-Asia). These inlets permit the slowing of the aerosol sample from the true air speed of the airplane, approximately 100 m/s, to a few m/s without subjecting the sample to turbulent deposition in the diffuser. This turbulence reduction is achieved through boundary layer suction in the diffuser. A suction flow control system will be installed in order to maintain the desired sample flow as aircraft operating parameters change. The data characterizing the inlet performance will be collected and used to calculate the net enhancement factors which include the effects of anisokinetic sampling and inertial enhancement of large particles in the diffuser.These new inlets will, for the first time, allow airborne sampling of atmospheric aerosols of sub- and supermicron size without turbulent losses of larger particles. Even though large particles will actually be enhanced by these inlets, it will be possible to quantify their concentrations because the enhancement can be calculated. The inlets will be made available to NCAR/ATD and the community for use in future programs after the completion of ACE-Asia.