Experimentelle Untersuchung der Schallabstrahlung einer turbulenten vorgemischten Freistrahlflamme

湍流预混自由射流火焰声辐射的实验研究

• 批准号: 135599953
• 负责人: Professor Dr.-Ing. Christian Oliver Paschereit
• 金额: --
• 依托单位: Fachgebiet Experimentelle Strömungsmechanik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/135599953?language=en
• 关键词: Experimentelle; Untersuchung; der; Schallabstrahlung; einer

The proposed project deals with experimental investigations of noise emissions of a turbulent premixed free jet flame under anechoic conditions. Obtained measurement data are used to validate associated numerical projects (TP2 (Janicka), TP3 (Schröder), and TP4 (Bockhorn) as well as to gain insight into the origin of combustion noise. The generic burner setup features both fundamental character and technical relevance. In the experiments, velocity fields are measured in detail, chemiluminescence images are recorded in order to visualize flame shape and position, respectively, and sound emissions are acquired with respect to frequency and direction. Acoustic data is obtained in the near field and in the far field of the flame. The simple de-sign of the burner allows for the investigation of the impact of different parameters on noise emissions. These parameters are mean mixing ratio of fuel and air mixture, spatial gradient of the mixing ratio, preheat temperature, momentum, and initial shear layer of the free jet flame. Hereby, turbulent length and time scales of the reacting flow are altered such that experiments cover different combustion regimes. Moreover, technical applications are mimicked by investigating lean mixtures and technically premixed flows. In addition to validation purposes, experimental data are used to establish an empirical model for noise emissions of turbulent premixed flames as a function of the aforementioned parameters.

该项目对湍流预混自由射流火焰在无回声条件下的噪声排放进行了实验研究。获得的测量数据用于验证相关的数值项目(TP2(Janicka)、TP3(Schröder)和TP4(Bockhorn))以及深入了解燃烧噪声的来源。通用燃烧器设置既具有基本特征，又具有技术相关性。在实验中，详细测量了速度场，记录了化学发光图像，以便分别可视化火焰的形状和位置，并获得了频率和方向上的声发射。获得了火焰近场和远场的声学数据。燃烧器的简单设计允许研究不同参数对噪声排放的影响。这些参数是燃料和空气混合物的平均混合比、混合比的空间梯度、预热温度、动量和自由射流火焰的初始剪切层。因此，反应流的湍流长度和时间尺度被改变，以使实验涵盖不同的燃烧状态。此外，通过研究稀薄混合物和技术预混流程来模拟技术应用。除验证目的外，还利用实验数据建立了湍流预混火焰噪声排放与上述参数的函数关系的经验模型。

项目成果

The Impact of Global Parameters of the Gas Mixture on Flow Field and Direct Combustion Noise of a Turbulent Jet Flame

混合气体整体参数对湍流射流火焰流场和直接燃烧噪声的影响

• DOI: 10.2514/6.2017-1472
• 发表时间: 2017
• 作者: H. Nawroth;C.O. Paschereit
• 通讯作者: C.O. Paschereit

Impact of burner plenum acoustics on the sound emission of a turbulent lean premixed open flame

燃烧器静压室声学对湍流稀薄预混明火声发射的影响

• DOI: 10.1177/1756827720956906
• 发表时间: 2020
• 期刊: International Journal of Spray and Combustion Dynamics
• 影响因子: 1.6
• 作者: S. Herff;K. Pausch;H. Nawroth;S. Schlimpert;C.O. Paschereit;W. Schröder
• 通讯作者: W. Schröder

Fractal Characteristics of Combustion Noise

燃烧噪声的分形特征

• DOI: 10.1115/1.4038766
• 发表时间: 2018
• 期刊: Journal of Engineering for Gas Turbines and Power
• 作者: Saurabh;Nawroth;Paschereit;Kabiraj
• 通讯作者: Kabiraj

Impact of Combustion Modeling on the Spectral Response of Heat Release in LES

• DOI: 10.1080/00102202.2018.1558218
• 发表时间: 2019-09
• 期刊: Combustion Science and Technology
• 影响因子: 1.9
• 作者: Feichi Zhang;T. Zirwes;P. Habisreuther;H. Bockhorn;D. Trimis;H. Nawroth;C. Paschereit

Experimental Investigation of the Influence of the Shear Layer on Direct Combustion Noise of a Turbulent Jet Flame

剪切层对湍流射流火焰直接燃烧噪声影响的实验研究

• DOI: 10.1115/gt2017-64467
• 发表时间: 2017
• 作者: H. Nawroth;C.O. Paschereit
• 通讯作者: C.O. Paschereit