概括
激光吸收光谱仪在模拟的爆炸后环境中准确测量气体压力和温度. 这种光学技术显示出动态流量场诊断的前景,温度在传感器值的2.6%内,压力在传感器值的5.4%内.
科学领域:
- 频谱学是一种光谱学.
- 光学测量 测量 光学测量
- 燃烧科学 燃烧科学
背景情况:
- 精确的压力和温度测量在动态流场中至关重要,特别是在爆炸后的环境中.
- 传统的传感器可以在恶劣的条件下受到限制,需要先进的光学技术.
研究的目的:
- 在模拟的爆炸后条件下实验验证基于激光吸收的压力和温度测量.
- 评估这个光学诊断器的动态范围,精度和灵敏度.
- 评估光谱数据库选择对测量准确性的影响.
主要方法:
- 使用可调节的垂直腔表面发射激光器 (MEMS-VCSEL) 进行水蒸气吸收光谱测量.
- 在冲击管中进行实验,模拟爆炸后的空气,水蒸气和CO2环境.
- 从光谱数据中推断的温度和压力在广泛的条件 (0.2567 atm, 2932300 K) 中.
主要成果:
- 基于激光吸收的温度在预测值的2.6%内 (71K RMSE).
- 在测试的数据库中,压力在传感器值 (3.8 atm RMSE) 的5.4%以内.
- 数字模拟表明,在典型的爆炸后条件下,压力诊断误差<10%,且假设简化.
结论:
- 激光吸收光谱为在模拟后爆炸环境中准确测量气体压力和温度提供了一种可行的方法.
- 该技术在动态流域应用中表现出良好的准确性和灵敏性.
- 仔细考虑光谱数据库对于优化测量准确度至关重要.
相关概念视频
Volatilization
526
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
526
Atomic Absorption Spectroscopy: Atomization Methods
662
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
662
Measuring Reaction Rates
25.8K
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
25.8K
Vapor Pressure
35.6K
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
35.6K
Measurement of Fluid Pressure
308
Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
308
Vapor Pressure of Fluid
1.5K
The vapor pressure of a fluid is a crucial concept in fluid mechanics, influencing phenomena such as boiling and cavitation. Vapor pressure refers to the pressure exerted by a vapor at a state of thermodynamic equilibrium with its corresponding liquid phase at a specific temperature. It represents the tendency of molecules to escape from the fluid surface into the vapor phase.
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
When a liquid is placed in a closed container with a small air space, and the space is evacuated, vapor molecules will...
1.5K


