NFAC is a unique facility primarily used for determining aerodynamic characteristics of large-scale and full-scale rotorcraft and powered-lift V/STOL aircraft, as well as tesing of wind turbines, parachutes, trucks, and other non-traditional types of testing.

2 天之前 · The National Full-Scale Aerodynamics Complex (NFAC) 40- by 80-/80- by 120-Foot Wind Tunnels are managed and operated by the U.S. Air Force’s Arnold Engineering Development Center under a long-term lease agreement with NASA.

Recent cracking of the National FuU Scale Aerodynamic Complex (NFAC) wooden fan blades has been attributed to higher mean loads and higher cyclic loads due to complex fan inflow disturbances.

Full-Scale Aerodynamics Complex (NFAC) located at the NASA Ames Research Center (fig. 1). it is an open circuit wind tunnel with a closed, rectangular test section. The maximum test section flow speed is approximately 100 knots (51 m/see). Figure 2 shows a schematic of the wind tunnel circuit. The 80- by 120-Foot Wind Tunnel shares a portion of its

The basic design of the NFAC wind tunnels is a subsonic tunnel built to test takeoff and landing qualities of aircraft. A major part of the wind tunnel is the fan drive system. The NFAC tunnels both share one fan system currently capable of 135,000 horsepower. This system is comprised of six 15-bladed fans that are 40 feet in diameter.

Fan: Fan: Stagnation Pressure/Temperature: Ambient, 485 to 580 R: Ambient, 485 to 580 R: Data System: Real-time DEC PDP 11/84, Main Comp. DEC VAX 8650: Real-time DEC PDP 11/84, Main Comp. DEC VAX 8650: Data Acquisition: Analog rec. on 200 channel, max sampling rate 96,000 s/sec; Digital rec. in 20 channel, Using Teledy

The current fan drive system is composed of six variable pitch fans, each 40 feet in diameter arranged in two rows of three. Each fan has 15 laminated wood blades and is powered by a 22,500 horsepower electric motor. The six fans rotate together at 180 rpm drawing 106 MW of electricity at full power while moving more than 60 tons of air per second.

2021年5月4日 · NFAC由40ft × 80ft （12m × 24m）回流式风洞和 80ft × 120ft (24m × 37m)直流式风洞组成，前者建成于 20 世纪 40 年代，后者是利用40ft × 80ft风洞动力段和部分洞体回路，于20世纪80年代改造扩建而成。 因此，NFAC是由两座连体全尺寸风洞构成的空气动力设施，它位于美国国家航空航天局（NASA）艾姆斯研究中心。 纵观NFAC建成后承担的试验任务，绝大多数是NASA 和军方的试验研究项目，NFAC 的运行经费主要靠NASA财政预算维持。 2003—2006 …

1/50th scale NFAC model Designed and fabricated to closely simulate the performance of the full scale NFAC facility. o Performs aerodynamics characteristics’ test of models. o Used to investigate possible quality of airflow and air exchange. Powered …

2022年7月28日 · NFAC是世界最大的风洞，其设计建设的初衷是用于全尺寸或大缩尺比固定翼飞机、短距/垂直起降飞机、直升机和倾转旋翼机气动特性试验研究，建成后也用于航天器、降落伞和大型车辆等航天和工业空气动力学试验研究。 NFAC由40ft×80ft（12m×24m）回流式风洞和80ft×120ft（24m×37m）直流式风洞组成，前者建成于20世纪40年代，后者是利用40ft×80ft风洞动力段和部分洞体回路，于20世纪80年代改造扩建而成。 因此，NFAC是由两座连体全尺寸风 …