{"id":369026,"date":"2024-05-29T07:51:22","date_gmt":"2024-05-29T07:51:22","guid":{"rendered":"\/forum\/?post_type=topic&p=369026"},"modified":"2024-05-29T07:51:22","modified_gmt":"2024-05-29T07:51:22","slug":"simulation-of-combustion-of-lng-and-lox-in-cd-nozzle","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/simulation-of-combustion-of-lng-and-lox-in-cd-nozzle\/","title":{"rendered":"Simulation of combustion of LNG and LOx in CD nozzle"},"content":{"rendered":"

So i want to study the temperature, velocity and pressure of the flow coming out of cd nozzle after the combustion process inside the chamber. 2 different inlets are provided, one for liquid methane (LNG) and another for liquid oxygen (LOx) and i want them to get mixed and ignite inside the chamber. I am not understanding why the flow is going downwards and velocity of flow is maximum at throat and decreasing further. Any suggestion would be appreciated.<\/span><\/p>\n

 <\/span><\/p>\n

Mesh: <\/span><\/p>\n

Target skewness: 0.9 (Default)<\/span><\/p>\n

Number of nodes: 176174<\/span><\/p>\n

Number of elements: 175014<\/span><\/p>\n

 <\/span><\/p>\n

Setup:<\/span><\/p>\n

1. Solver: <\/span><\/p>\n

Pressure based, steady and absolute<\/span><\/p>\n

 <\/span><\/p>\n

2. Model: <\/span><\/p>\n

k-epsilon standard with standard wall function and curvature correction<\/span><\/p>\n

 <\/span><\/p>\n

3. Species: <\/span><\/p>\n

Non premixed combustion with Inlet diffusion, chemical equilibrium and non-adiabatic enabled at standard atmospheric operating pressure.<\/span><\/p>\n

3.1.  Boundary: <\/span><\/p>\n

CH4 = 1 and O2 = 1 with fuel temperature 90K and oxidizer temperature 60K.<\/span><\/p>\n

3.2. Calculated Pdf table.<\/span><\/p>\n

3.3. Radiation is enabled as Discrete ordinates <\/span><\/p>\n

 <\/span><\/p>\n

4. Boundary Condition:<\/span><\/p>\n

Fuel inlet (mass flow inlet)<\/span><\/p>\n

Mass flow inlet = 0.017 kg\/s<\/span><\/p>\n

Initial Gauge pressure = 2465000 Pa<\/span><\/p>\n

Turbulent intensity = 10%<\/span><\/p>\n

Mean Mixture Fraction = 1<\/span><\/p>\n

Mixture Fraction Variance = 0<\/span><\/p>\n

 <\/span><\/p>\n

 <\/span><\/p>\n

Oxygen inlet (mass flow inlet)<\/span><\/p>\n

Mass flow inlet = 0.026 kg\/s<\/span><\/p>\n

Initial Gauge pressure = 2465000 Pa<\/span><\/p>\n

Turbulent intensity = 10%<\/span><\/p>\n

Mean Mixture Fraction = 0<\/span><\/p>\n

Mixture Fraction Variance = 0<\/span><\/p>\n

 <\/span>Outlet (pressure outlet)<\/span><\/p>\n

Gauge pressure = 96500 Pa<\/span><\/p>\n

Initialization method: Hybrid<\/span><\/p>\n

\"\"<\/span><\/p>\n

\"\"<\/p>\n

 \"\"\"\"\"\"<\/span><\/p>\n","protected":false},"template":"","class_list":["post-369026","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["23.216.133.166"],"_bbp_subscription":["349846","101181"],"_btv_view_count":["271"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["369026"],"_bbp_forum_id":["27792"],"_bbp_engagement":["101181","349846"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["369921"],"_bbp_last_active_id":["369921"],"_bbp_last_active_time":["2024-06-05 13:04:08"]},"test":"hiturao21gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369026","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369026\/revisions"}],"predecessor-version":[{"id":369027,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/369026\/revisions\/369027"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=369026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}