The construction of airfoil pressure models by the plate method: Achievements, current research, technology development and potential applications

A method of constructing airfoils by inscribing pressure channels on the face of opposing plates, bonding them together to form one plate with integral channels, and contour machining this plate to form an airfoil model is described. The research and development program to develop the bonding technology is described as well as the construction and testing of an airfoil model. Sample aerodynamic data sets are presented and discussed. Also, work currently under way to produce thin airfoils with camber is presented. Samples of the aft section of a 6 percent airfoil with complete pressure instrumentation including the trailing edge are pictured and described. This technique is particularly useful in fabricating models for transonic cryogenic testing, but it should find application in a wide ange of model construction projects, as well as the fabrication of fuel injectors, space hardware, and other applications requiring advanced bonding technology and intricate fluid passages

High-Reynolds-Number Test of a 5-Percent-Thick Low-Aspect-Ratio Semispan Wing in the Langley 0.3-Meter Transonic Cryogenic Tunnel: Wing Pressure Distributions

A high Reynolds number test of a 5 percent thick low aspect ratio semispan wing was conducted in the adaptive wall test section of the Langley 0.3 m Transonic Cryogenic Tunnel. The model tested had a planform and a NACA 64A-105 airfoil section that is similar to that of the pressure instrumented canard on the X-29 experimental aircraft. Chordwise pressure data for Mach numbers of 0.3, 0.7, and 0.9 were measured for an angle-of-attack range of -4 to 15 deg. The associated Reynolds numbers, based on the geometric mean chord, encompass most of the flight regime of the canard. This test was a free transition investigation. A summary of the wing pressures are presented without analysis as well as adapted test section top and bottom wall pressure signatures. However, the presented graphical data indicate Reynolds number dependent complex leading edge separation phenomena. This data set supplements the existing high Reynolds number database and are useful for computational codes comparison

Cooling system for high speed aircraft

The system eliminates the necessity of shielding an aircraft airframe constructed of material such as aluminum. Cooling is accomplished by passing a coolant through the aircraft airframe, the coolant acting as a carrier to remove heat from the airframe. The coolant is circulated through a heat pump and a heat exchanger which together extract essentially all of the added heat from the coolant. The heat is transferred to the aircraft fuel system via the heat exchanger and the heat pump. The heat extracted from the coolant is utilized to power the heat pump. The heat pump has associated therewith power turbine mechanism which is also driven by the extracted heat. The power turbines are utilized to drive various aircraft subsystems, the compressor of the heat pump, and provide engine cooling

High Reynolds Number tests of the NASA SC(2)-0012 airfoil in the Langley 0.3-meter transonic cryogenic tunnel

A wind-tunnel investigation of the NASA SC(2)-0012 airfoil has been conducted in the Langley 0.3-Meter Transonic Cryogenic Tunnel. This investigation supplements the two-dimensional airfoil studies of the Advanced Technology Airfoil Test Program. The Mach number was varied from 0.60 to 0.84. The stagnation temperature and pressure were varied to provide a Reynolds number range from 6 to 40 x 10 to the 6th power based on a 6.0-in. (15.24-cm) airfoil chord. No corrections for wind-tunnel wall interference have been made to the data. The aerodynamic results are presented as integrated force and moment coefficients and pressure distributions without any analysis

Orbiter thermal pressure drop characteristics for shuttle orbiter thermal protection system components: High density tile, low density tile, densified low density tile, and strain isolation pad

Pressure drop tests were conducted on available samples of low and high density tile, densified low density tile, and strain isolation pads. The results are presented in terms of pressure drop, material thickness and volume flow rate. Although the test apparatus was only capable of a small part of the range of conditions to be encountered in a Shuttle Orbiter flight, the data serve to determine the type of flow characteristics to be expected for each material type tested; the measured quantities also should serve as input for initial venting and flow through analysis

Differences in Offending Patterns between Adolescent Sex Offenders High or Low in Callous and Unemotional Traits

Adolescents commit nearly one-fifth of the sex crimes each year. Among those offenders exists a group of adolescent sex offenders with callous and unemotional (CU) traits who seem to show a more severe pattern of sexual offending. The current study attempts to test the importance of these traits by comparing adolescent sex offenders high or low on CU traits based on victim and offense characteristics, and offending history. A sample of 150 detained adolescents with a current sexual offense conviction were assessed through self-report, clinical interview, and file review. Results indicated that after controlling for a history of antisocial behaviors, the high CU group was more likely to have a greater number of victims, use more violence with victims, and engage in more offense planning than the low CU group. The high CU group was also more likely to offend against both strangers and family

Support interference of wind tunnel models: A selective annotated bibliography

This bibliography, with abstracts, consists of 143 citations arranged in chronological order by dates of publication. Selection of the citations was made for their relevance to the problems involved in understanding or avoiding support interference in wind tunnel testing throughout the Mach number range. An author index is included

Differences in Offending Patterns between Adolescent Sex Offenders High or Low in Callous and Unemotional Traits

Adolescents commit nearly one-fifth of the sex crimes each year. Among those offenders exists a group of adolescent sex offenders with callous and unemotional (CU) traits who seem to show a more severe pattern of sexual offending. The current study attempts to test the importance of these traits by comparing adolescent sex offenders high or low on CU traits based on victim and offense characteristics, and offending history. A sample of 150 detained adolescents with a current sexual offense conviction were assessed through self-report, clinical interview, and file review. Results indicated that after controlling for a history of antisocial behaviors, the high CU group was more likely to have a greater number of victims, use more violence with victims, and engage in more offense planning than the low CU group. The high CU group was also more likely to offend against both strangers and family

Addressing Climate Induced Displacement: An Analysis of Protection Policies for Environmental Migrants

One of the fastest growing populations of displaced people are those forced to migrate because of climate change, but under current international legal agreements they receive no protections or support. In response to the lack of security and stability provided to climate displaced populations and host countries, supplementary agreements have been proposed at the international level to address the gaps in existing policy. The purpose of this analysis is to identify policy agreements intended to support environmental migrants during times of displacement, evaluate the policies’ effectiveness, and determine what issues they address regarding climate induced displacement. All of the policies are evaluated on their ability to provide individual protections to refugees and develop support systems for host countries that assist in burden sharing while also holding signatories accountable for their actions through credible commitments. Policies examined in this paper include the Nansen Initiative, the Global Compact for Migration, and the Cartagena Declaration. The analysis finds that there is no clear policy that provides both strong protections and support systems. Rather a combination of the agreements is necessary to develop an international migration system equipped to manage climate induced displacement. The conclusion also argues the need for humanity to find an effective way to adapt to the effects of climate change to survive

Predictors of recidivism in adolescent offenders

Adolescent offenders commit a significant number of physical and sexual assaults every year. A critical task for researchers and clinicians is to understand the distinct pathways that lead to these serious types of offending. The current study attempts to test the importance of these different pathways by comparing violent, violent sex, non-violent sex, and non-violent offenders based on SAVRY risk items, reoffending, and effects of treatment. A sample of 517 adolescents on probation was assessed for several risk factors (i.e., anger management, ADHD, low empathy/remorse) by probation officers. Recidivism over 12 months was assessed from official records. Results indicated that after controlling for race, groups differed on several risk factors, with significant differences noted between violent and non-violent sex offenders for anger management and attention deficit/hyperactivity problems, as well as violent sex offenders and all other offenders for low empathy/remorse. In comparison to non-violent offenders, violent offenders had more any re-offense and violent re-offense. While risk factors partially predicted the relationship between offender and recidivism, treatment did not moderate this relationship