Scale-resolved and stochastic approaches for noise prediction in duct singularities
Başlık çevirisi mevcut değil.
- Tez No: 597469
- Danışmanlar: PROF. WOLFGANG POLIFKE
- Tez Türü: Doktora
- Konular: Enerji, Energy
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2017
- Dil: İngilizce
- Üniversite: Technısche Unıversıtat Munchen
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
Özet yok.
Özet (Çeviri)
This study focuses on the numerical investigation of the broadband noise generated by a low- Mach-number flow passing through ducted diaphragms. The goal of the study is to develop a fast and accurate tool based on a stochastic noise prediction method. Various noise prediction techniques including a direct approach and different hybrid approaches were implemented and were compared against experimental data. The experimental data was acquired performing induct aeroacoustic measurements on the test campaign installed in the anechoic chamber of the von Karman Institute for Fluid Dynamics. The measured data was post-processed using a multiport method to identify the active source. The scale-resolved flow data is provided from compressible Large Eddy Simulation. The applicability and the accuracy of a hybrid approach that combines Lighthill's analogy and Green's function for sound generation and radiation, respectively, are investigated. A tailored Green's function is proposed using the mode-matching technique to account for the scattering of single and tandem diaphragms in cylindrical ducts. Unsteady flow data required for the noise prediction approach is provided using the LES data, and alternatively through a stochastic method. The latter, namely 'Stochastic Noise Generation and Radidation' (SNGR) method, synthesizes turbulent velocity field satisfying the two-point statistics of a target mean flow. A grouping scheme for the noise sources based on the octree structure is introduced to minimize the memory requirements and further to reduce the computational cost. Comparison of the SNGR results and the LES predictions and measured data revealed that promising noise predictions can be achieved using the SNGR method given a proper anisotropy model and the spectral decay rate.
Benzer Tezler
- Yatırım kararlarının değerlemesinde reel opsiyonları bilişim teknolojileri yatırım uygulaması
Valuation of investment decisions with real options: Information technologies investment practice
SELÇUK ALTAN ÖZOĞUL
- Toplam faktör verimliliğinin büyümesi, bileşenleri ve makroekonomik belirleyicileri: OECD ülkeleri için bir analiz
Growth, components and macroeconomic determinants of total factor productivity: An analysis for OECD countries
NADİDE YİĞİTELİ
- The impact of sanctions and pre¬release policies on recidivism
Afların ve yaptırımların tekrar suç işleme oranları üzerine etkisi
MEHMET BARAN DİŞPENÇE
Yüksek Lisans
İngilizce
2022
EkonomiGalatasaray ÜniversitesiEkonomi Ana Bilim Dalı
DOÇ. DR. BİLGE ÖZTÜRK GÖKTUNA
- Rüzgar enerjisi dönüşüm sistemlerinin aerodinamik kapsamı ve güç belirlenmesi analizlerinde potansiyel akım yöntemleri
Aerodynamic aspects of wind energy conversion systems and potential flow methods in performance prediction analysis
ALİ ALPER AKYÜZ
Yüksek Lisans
Türkçe
1997
Uçak Mühendisliğiİstanbul Teknik ÜniversitesiUçak Mühendisliği Ana Bilim Dalı
DOÇ. DR. M. ADİL YÜKSELEN
- S-Transformasyonu ve yatay kontrol ağlarında deformasyon analizi
S-Transformation and deformation in horizontal control networks
BEDRETTİN BAŞKAYA