Numerical investigation of detonation propagation through small orifice holes

• Autorzy: Vashishtha Ashish , Callaghan Dean , Nolan Cathal , Deiterding Ralf

Identyfikatory

DOI

10.2478/tar-2021-0014

Warianty tytułu

PL

Badania numeryczne propagacji fali detonacyjnej przez małe otwory

• Języki publikacji: EN

Abstrakty

EN

Seeking to better understand the physical phenomena underlying detonation wave propagation through small holes (especially the phenomenon of detonation re-initiation or its failure), we investigated the propagation of a detonation wave along a tube filled with a hydrogen-oxygen mixture diluted with argon, in the presence of obstacles with a small orifice hole. Numerical simulations were performed in a two-dimensional domain using adaptive mesh refinement and by solving compressible Euler equations for multiple thermally perfect species with a reactive source term. A premised mixture of H₂:O₂:Ar at a ratio 2:1:7 at 10.0 kPa and 298 K was used in a 90 mm diameter tube with a detonation wave travelling from one end. We found that a single orifice placed at 200 mm from one end of the tube, with varying diameters of 6, 10, 14, 16, 18, 30, and 50 mm, showed an initial decoupling of the detonation wave into a shockwave and flame front. The detonation wave fails to propagate along the tube for orifice diameters less than λ, while it propagates by different re-initiation pathways for orifice diameters greater than λ, where λ is the cell-width for regular detonation propagation.

PL

Dążąc do lepszego zrozumienia zjawisk fizycznych leżących u podstaw propagacji fali detonacyjnej przez małe otwory (w szczególności zjawiska ponownego zapłonu lub jego brak) zbadano propagację fali detonacyjnej wzdłuż rury wypełnionej mieszaniną wodoru i tlenu rozcieńczoną argonem, w obecności przeszkody o małym otworze. Symulacje numeryczne przeprowadzono w dziedzinie dwuwymiarowej, stosując adaptacyjne dostrajanie siatki i rozwiazując równania Eulera dla wielu termicznie doskonałych próbek z reaktywnym źródłem. Mieszaninę H₂:O₂:Ar w stosunku 2:1:7 przy ciśnieniu 10.0 kPa i temperaturze 298 K zastosowano w rurze o średnicy 90 mm z falą detonacyjną rozchodzącą się z jednego końca. Stwierdziliśmy, że pojedynczy otwór umieszczony w odległości 200 mm od jednego z końców rury, o różnych średnicach 6, 10, 14, 16, 18, 30 i 50 mm, spowodował początkowe rozdzielenie fali detonacyjnej na falę uderzeniową i czoło płomienia. Fala detonacyjna nie rozprzestrzenia się wzdłuż rury dla średnic otworu mniejszych niż λ, podczas gdy rozprzestrzenia się różnymi drogami ponownego zapłonu dla średnic otworu większych niż λ, gdzie λ jest szerokością komórki dla regularnej propagacji detonacji.

Słowa kluczowe

EN

detonation; propagation; hydrogen-oxygen mixture; numerical simulations; Adaptive Grid Refinement

PL

detonacja; propagacja; mieszanka wodór-tlen; symulacje numeryczne; adaptacyjna siatka numeryczna

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Transactions on Aerospace Research
• Rocznik: 2021
• Tom: Nr 3 (264)
• Strony: 17--33
• Opis fizyczny: Bibliogr. 24 poz., rys., wzory

Twórcy

autor

Vashishtha Ashish

• Department of Aerospace Mechanical and Electronics Engineering, Institute of Technology Carlow, Kilkenny Rd, Moanacurragh, Ireland

• https://orcid.org/0000-0002-8385-3740

autor

Callaghan Dean

• The Centre for Research and Enterprise in Engineering (engCORE), Institute of Technology Carlow, Kilkenny Rd, Moanacurragh, Ireland

• https://orcid.org/0000-0002-8435-6252

autor

Nolan Cathal

• Department of Aerospace Mechanical and Electronics Engineering, Institute of Technology Carlow, Kilkenny Rd, Moanacurragh, Ireland

• https://orcid.org/0000-0003-4748-3292

autor

Deiterding Ralf

• School of Engineering, University of Southampton, University Road, SO17 1BJ Southampton, UK

• https://orcid.org/0000-0003-4776-8183

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).