Table of Contents

Aerodynamics Series

2020년 12월 8일 화요일

Announcement for Break (Before 2021 March?)

I always try to deliver news, opinion, and design process which I involve. 

I enjoy this activities and this is the reason I run this Blog. 

However, in recent month, I am now preparing some process which is necessary for my future. 


It will take few months, then, I can come back to Blog again. 

I expect that the prepared process will bring plenty of contents and 'More Aerospace Life' for me. 



2020년 11월 3일 화요일

Supersonic Airliner design using Joint wing (Diamond wing) - Part 2

 

Previous Work Status

- Initial Kick-Off & Design Progress

The new topic for My page : Optimization of Supersonic aerodynamic aircraft
Supersonic Airliner design using Joint wing (Diamond wing) - Part 1


- Other Supersonic Jet or Innovative Design Reference


Boeing's New Truss-Braced Wing

Boeing's E-X project


Various SST project images
Boomsupersonic's XB-1



- Performance Evaluation via Missile / Flight-SIM


Missile-SIM : Performance Evaluation for Iskander / Kh-47M2 Kinzhal & ATACMS+Booster


Flight-SIM : Trajectory & Performance Analysis for Jet Aircraft

Flight-SIM : Generic DB of single-aisle Airliner : Part 2

Flight-SIM : W.I.P of the SIM II




2. Construction of Aerodynamic/Propulsion/Weight DB

1) Weight DB

 Weight of the aircraft is estimated from the reference as shown in the Figure below. Reference roughly configured the weight of the Truss-Wing as 65% of the conventional wing. From this result, the ZFW (Zero-Fuel-Weight) is saved about 3 tons



2) Propulsion DB

 Basically I made no difference on the thrust value of the CFM-56 class engine while I assumed pressure recovery data based on the 3 shock inlet. 


3) Aerodynamic DB

 Geometry of the two aircraft, SupLiner Mk.1 and A320 are shown; similar size of cabin and engine are represented. Only modification of the engine is added shock-cone to gain enough pressure recovery value in the supersonic condition. 

 Specific estimation result for the generic A320 class airliner is shown in my previous article (Flight-SIM : Generic DB of single-aisle Airliner : Part 2). 


 Truss-Supersonic wing having less camber and incidence angle has much smaller CL value at the given AoA while it gives much smaller drag than the conventional wing due to its swept angle. 


 Truss-Supersonic wing shows similar L/D in M0.4~0.7 condition where the generic A320 mainly flight. However, in Mach 0.9, where the drag of the conventional one is already risen, Truss-Supersonic wing surpass max L/D value of the conventional one. 




 In supersonic region, M1.1~1.8, estimation of the aerodynamic value is only calculated for the Sup-Liner; Cl_aoa value is peaked at M1.1 and reduced. Minimum drag is in 'drag-rise' at M1.1, so, L/D become lower than the conventional's subsonic case. 

 Flight-SIM will evaluate Range and Fuel economy performance in the next article. 



 CFD result is supplementary provided (Mesh, iteration, case set up are very rough compare to the full-academic or industrial purpose set up due to '4-core laptop for FLUENT'; please understand about it)



M1.1 AoA 0deg - Mach Contour


M1.8 AoA 6deg - Mach Contour



M1.8 AoA 6deg - Pressure Contour

2020년 10월 20일 화요일

Airbus' AFJT Trainer replacement proposal for C-101 and F-5M?

Airbus proposed Spain for the replacement of C-101 and F-5M aircraft

 Probably similar class to this new project are Korean T-50 and Boeing's T-7

Boeing's T-7 Redhawk

 Boeing is Now T-X 
 Aerodynamic Analysis of Boeing T-X
 Boeing T-X Flight video

 There are some images and link related to this news


 General impression of the aircraft is similar to mix of Hawk, Alpha-Jet, T-7, and F-16 while it has extremely slim fuselage as shown in the Figures.