Volumetric density and temperature fields produced by a hot air jet with different nozzle shapes at 120C

Measurements of volumetric density are provided for a hot air jet at 120C produced by a consumer-grade Yihua995D hot air gun as a demonstration of our newly-developed rotating-nozzle telecentric tomo-BOS technique. The jets examined are all produced at the same conditions with the hot air gun fan running at maximum power, and a jet velocity of 17m/s measured at the nozzle center for the circular nozzle case.

Nozzle cases tested: Circular; Rectangular; Elliptical; Diamond; Double-circular. The Rectangular, Elliptical and Diamond cases have a 2:1 aspect ratio, and the double-circular case has two circular nozzles separated to test the technique when overlapping views of two Schlieren objects collapse in the camera view. All nozzle orifices have an area of 25 mm^2.

Files provided include:

Nozzle shapes are provided as .STL files;

Volume reconstructions are provided as Paraview VTK files. 

A compiled visualization file is provided as a Paraview PVSM file.

The raw image files of the background captured, together with the raw density fields, are provided as a DaVis 10.1 project (2-part Zip file).

本数据集提供了由消费级谊华995D（Yihua995D）热风枪产生的120℃热空气射流的体积密度测量结果，作为我们新近研发的旋转喷嘴远心层析背景纹影（rotating-nozzle telecentric tomo-BOS）技术的演示案例。

本次测试的所有射流均采用统一工况制备：热风枪风扇运行于最大功率模式，圆形喷嘴工况下的射流中心轴处实测流速为17m/s。

本次测试涵盖的喷嘴类型包括：圆形、矩形、椭圆形、菱形及双圆形喷嘴。其中矩形、椭圆形与菱形喷嘴的长宽比为2:1；双圆形喷嘴包含两个分离的圆形喷口，用于验证当两个纹影对象的视场在相机画面中发生重叠时的技术适配性。所有喷嘴的通流面积均为25 mm²。

本次提供的数据集文件如下：
1. 喷嘴形状文件，格式为.STL；
2. 体积重建结果文件，格式为帕拉维尤（Paraview）VTK文件；
3. 帕拉维尤（Paraview）PVSM格式的可视化项目文件；
4. 背景原始图像与原始密度场数据，以DaVis 10.1项目文件形式封装，为分卷ZIP压缩包。