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-亚洲计划（气溶胶特性试验-亚洲）期间制造和部署。这些入口允许将气溶胶样品从飞机的真实空气速度（大约100 m/s）减慢到几m/s，而不会使样品在扩散器中经受湍流沉积。这种湍流减少是通过扩散器中的边界层抽吸来实现的。将安装一个吸入流量控制系统，以便在飞机运行参数变化时保持所需的样品流量。将收集表征进气道性能的数据，并用于计算净增强因子，其中包括扩散器中大颗粒的非等动力采样和惯性增强的影响。这些新的进气道将首次允许对亚微米和超微米尺寸的大气气溶胶进行空气采样，而不会损失较大颗粒的湍流。尽管这些入口实际上会增强大颗粒，但由于可以计算增强，因此可以量化它们的浓度。这些入口将在ACE亚洲项目完成后提供给NCAR/ATD和社区用于未来的项目。

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.