Turbulentny przepływ gazu w wypełnieniach o złożonej geometrii

Tobiś, J.

Artykuł - szczegóły

Tytuł artykułu

Turbulentny przepływ gazu w wypełnieniach o złożonej geometrii

Autorzy

Tobiś J.

Identyfikatory

Warianty tytułu

Języki publikacji

Abstrakty

Eksperymentalne i numeryczne badania turbulentnego przepływu powietrza przeprowadzono w modelowych wypełnieniach, zbudowanych z kuł i różnych, aczkolwiek ściśle zdefiniowanych przegród. Umieszczone między kulami przegrody spełniały rolę promotorów lub inhibitorów turbulencji. Lokalną prędkość gazu oraz strukturę turbulencji wewnątrz modelowych układów badano przy użyciu termoanemometru, podczas gdy ilość przepływającego gazu i spadek jego ciśnienia mierzono za pomocą zwężki i mikromanometrów. Numeryczne symulacje turbulentnego przepływu gazu wykonano równolegle w trzech skalach przestrzennych. Charakterystyczne asymetrie rozkładów gęstości prawdopodobieństwa lokalnie zmierzonych fluktuacji prędkości gazu aproksymowano modelem uzasadniającym powiązanie kształtu tych rozkładów z kształtem profilu prędkości gazu uśrednionej w czasie. Z kolei, przestrzenne rozkłady tej prędkości oraz spadek ciśnienia gazu w reprezentatywnych fragmentach wypełnień pseudohomogenicznych wyliczono z użyciem standardowego modelu ^epsilon. Natomiast, modelowanie turbulentnego przepływu gazu w wypełnieniach tworzących bardziej złożone struktury przestrzenne przeprowadzono stosując model pseudohomoge-niczny lub makrokorelacje. Efektywność hybrydowej metody modelowania turbulentnych przepływów potwierdzono porównując wyniki numerycznych symulacji i doświadczeń wykonanych w każdej z wyróżnionych skal. Pokazano na wielu modelowych przykładach, w jaki sposób rozkład prędkości gazu i spadek jego ciśnienia zależą od kształtu i przestrzennego ułożenia poszczególnych elementów wypełnień niejednorodnych.

The experimental and numerical investigations of air turbulent flow were performed in the model packings consisting of spheres and different obstacles of precisely defined shapes. The inserts played the role of turbulence promoters or inhibitors. The flow rate and the pressure drop within the model packings were measured using an orifice and micro-manometers, whereas the local gas velocity distribution and the turbulence structure were investigated using an thermo-anemometer. Numerical simulations were performed at three spatial scales. The characteristic shapes of the probability density distributions of measured flow fluctuations were approximated using a model indicating the relationship between the shapes of these distributions and the shape of the gas velocity profile averaged in time. Next, the flow patterns and pressure drop within representative units of pseudo--homogenous packings were numerically simulated using the standard /:-epsilon model. In the case of more complex packing structures a combined method of turbulent flow modelling was applied using the pseudo-homogenous model or macro-correlations. The measured and numerically predicted flow parameters reveal an acceptable level of agreement. As a result, the manner in which the pressure drop and the gas velocity distribution depend on the packing complex geometry has been presented.

Słowa kluczowe

turbulentny przepływ gazu metoda Hursta modele turbulencji modele mechanistyczne wypełnienia

gas turbulent flow

Wydawca

Oficyna Wydawnicza Politechniki Warszawskiej

Czasopismo

Prace Wydziału Inżynierii Chemicznej i Procesowej Politechniki Warszawskiej

Rocznik

2004

Tom

Vol. 29, z. 1/2

Strony

3--135

Opis fizyczny

Bibliogr. 287 poz., rys., tab., wykr.

Twórcy

autor

Tobiś J.

Instytut Chemii Fizycznej PAN

Bibliografia

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