Table of Contents

Aerodynamics Series

2019년 10월 2일 수요일

Missile-SIM : Performance Evaluation for KM-SAM class missile


Previous Work Status

Initial Version of Missile-SIM for Performance evaluation
Aerodynamic Validation of Missile-SIM for Trajectory 
AIM-120C Study using Missile-SIM : Part 1 - Sensitivity
AIM-120C Study using Missile-SIM : Part 2 - Launch Condition
AIM-120C Study using Missile-SIM : Part 2 - Launch Condition - revision
Patch note of Missile-SIM : Guidance Algorithm is added w/ Real-Time plot
W.I.P status of Missile-SIM : Addition of Air-propulsion part 1
W.I.P status of Missile-SIM : Addition of Air-propulsion part 2
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 1 : Baseline Comparison
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 2 : Sensitivity Analysis
AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 3 : Few mentions
W.I.P status of Missile-SIM : Addition of 3D Coordinate
W.I.P status of Missile-SIM : Development of Few generic bodies for Further Missile-SIM
Missile-SIM : Performance Evaluation for ATACMS class missile




 1. Modeling of KM-SAM

 KM-SAM is the Surface-to-Air-Missile developed in Korea to replace the aged MIM-23 Hawk. Known specification is shown below. I assumed weight of the propellant is about half of it (~200kg), and ISP is set to 260s. 






2. Trajectory Simulation of generic KM-SAM

1) Baseline case : Vertical and few Horizontal shot


After I made generic model of the missile, I shoot the missile in vertical and horizontal plane. 

The result shows AoA of the missile exceed 10deg after it decelerated to M2.5 at 250kft. However, this altitude will fall significantly when the missile goes horizontal direction. 




The result shows the missile could reach M4.5 as max speed and less than 100km in about 140s. This condition is only possible when the missile maintain about 40kft. This would the kinematic maximum range. 



The result shows the missile could reach M4.5 as max speed and about 40km at about 10kft in 1min. This would be the usual air-to-surface engagement scenario for the missile. 


 At sea level, missile go slightly above M4 and reach 35km. However, maneuver of the target will decrease the range. 



2) Air-Launched KM-SAM : Long range missile ?


As a interest, I shoot this missile as an Air-to-Air missile. Initial condition of the aircraft is M1.1 or M1.3 with specific altitude while it is terminated at the same speed or 300s of update. 

( see AIM-120C Study using Missile-SIM : Part 2 - Launch Condition)




 At sea level, missile go slightly above M5 and reach 50km... Because it has larger body than AIM-120C, it almost mimic the performance of the AIM-54 class missile.

At 10kft, it could reach for more than 60km with supersonic speed in 1min. 

At 30kft, it could reach 140km in 140s, it just slightly inferior than generic Ramjet Air-to-Air missile. However, I should notice that the missile is much heavier than the generic Meteor missile. 

( see AIM-120C Study using Missile-SIM : Part 3 - CUDA / LREW / METEOR types. 1 : Baseline Comparison)



At 50kft, it can achieve almost 350km range in 300s with high speed. 



In very-long climb case, because rocket motor is powerful, it can reach 110kft and maintain its speed 
(it is unusual for Air-to-Air engage, and probably usual for low-altitude defense of ballistic missile?)

3. Conclusion

I had modeled KM-SAM model approximately, and tested several trajectory including not only Surface-to-Air also Air-to-Air conversion. 

The modeled missile has similar characteristics of known specification, and confirm 40km of effective range for whole altitude. 

Because it is large and powerful missile than the conventional Air-to-Air missile like AIM-120C, it has superior kinematic characteristics than that. However, amount of performance increase is almost similar to that of Ramjet missile.

If the missile were converted to Air-to-Air purpose, weight of the missile is not fitted to modern trend of it. While the recent performance upgrade of the conventional missile is trajectory optimization or adoption of the ramjet. 

K-SAAM is probably more fitted to air-to-air conversion. 




Various SST project images

Previous Work Status

The new topic for My page : Optimization of Supersonic aerodynamic aircraft


 I gathered some images of SST projects from the past; most of them are coming from secreprojects.co.uk. I hope those images provides ideas for the SST optimization. From now on, I will summarize reports related to SST, SLFC and other drag reduction techniques while optimization of the supersonic aerodynamic body is proceeded. 


1. Boeing's SST




















2. Convair's SST



3. Douglas' SST








4. Lockheed's SST















5. North American's SST





6. Republic's SST




7. Unknown or etc