Jim Davenport, a veteran of 28 years with the San Francisco Giants' organization as a player, coach and minor league skipper, has been named the new manager of the National League club, a team source confirmed yesterday.

A news conference was called for today to announce the hiring. Danny Ozark finished the 1984 season as the Giants' manager, but said he didn't want the job in 1985. Ozark took over for Frank Robinson, who was fired Aug. 5.

Davenport, 51, was among five finalists for the job. The others were Felipe Alou, Steve Boros, Joey Amalfitano and Rene Lachemann . . .

Relief ace Willie Hernandez of the world champion Detroit Tigers and Milwaukee Brewers catcher Jim Sundberg demanded to be traded -- a move that is part of baseball's negotiating process.

And Boston Red Sox pitcher Rich Gale and Cincinnati Reds first baseman Tony Perez became the 51st and 52nd players to file for free agency.

Under the 1980 basic agreement, a player acquired by one team from another while he has time remaining on a long-term contract has the right to demand a trade at the end of that season. In most cases, a new agreement between the player and his existing team is worked out.

If it is not, and the team fails to trade the player by March 15, he becomes a free agent "eligible to negotiate and contract with any club without any restrictions or qualifications," according to the basic agreement . . .

The D.C. Baseball Commission will distribute 100,000 sample ticket applications in the metropolitan area next week to solicit support for efforts to help bring baseball back to Washington. The commission's area-wide drive will be launched formally Nov. 7 with an open luncheon at the Touchdown Club.